diff --git a/.bazelrc b/.bazelrc
index 06ac540d..cd8cb110 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -1,8 +1,13 @@
-build:asan --strip=never 
+# Make globs that don't match anything fail
+common --incompatible_disallow_empty_glob
+
+build:asan --strip=never
 build:asan --copt -fsanitize=address
 build:asan --copt -DADDRESS_SANITIZER
 build:asan --copt -O0
 build:asan --copt -fno-omit-frame-pointer
 build:asan --copt -g
-build:asan --linkopt -fsanitize=address 
+build:asan --linkopt -fsanitize=address
 build:asan --cc_output_directory_tag=asan
+
+build:ssl --define=with_civetweb_ssl=true
diff --git a/.clang-format b/.clang-format
index f6cb8ad9..5650f22c 100644
--- a/.clang-format
+++ b/.clang-format
@@ -1 +1,2 @@
 BasedOnStyle: Google
+DerivePointerAlignment: false
diff --git a/.github/renovate.json5 b/.github/renovate.json5
new file mode 100644
index 00000000..72343d0f
--- /dev/null
+++ b/.github/renovate.json5
@@ -0,0 +1,4 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:recommended"],
+}
diff --git a/.github/workflows/bazel-ci.yml b/.github/workflows/bazel-ci.yml
new file mode 100644
index 00000000..afbc158f
--- /dev/null
+++ b/.github/workflows/bazel-ci.yml
@@ -0,0 +1,54 @@
+name: Bazel CI
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Bazel on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+        include:
+          - os: macOS-latest
+            bazel_args: "--cxxopt=-std=c++17"
+          - os: ubuntu-latest
+            bazel_args: "--cxxopt=-std=c++17"
+          - os: windows-latest
+            bazel_args: "--cxxopt=/std:c++17"
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v4
+
+      - name: Generate German locale on Ubuntu
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get remove -y --purge man-db # avoid time-consuming trigger
+          sudo apt-get update
+          sudo apt-get install -y locales
+          sudo locale-gen de_DE.UTF-8 # used by SerializerTest
+
+      - name: Install telegraf on macOS
+        if: runner.os == 'macOS'
+        run: brew install telegraf
+
+      - name: Build with SSL
+        if: runner.os != 'macOS'
+        run: bazel build ${{ matrix.bazel_args }} --config=ssl //...
+
+      - name: Test with SSL
+        if: runner.os != 'macOS'
+        run: bazel test ${{ matrix.bazel_args }} --config=ssl --test_output=all //...
+
+      - name: Build
+        run: bazel build ${{ matrix.bazel_args }} //...
+
+      - name: Test
+        run: bazel test ${{ matrix.bazel_args }} --test_output=all //...
+
+      - name: Scraping Test
+        if: runner.os == 'macOS'
+        run: bazel test ${{ matrix.bazel_args }} --test_output=all //pull/tests/integration:scrape-test
diff --git a/.github/workflows/cmake-ci.yml b/.github/workflows/cmake-ci.yml
new file mode 100644
index 00000000..91f74778
--- /dev/null
+++ b/.github/workflows/cmake-ci.yml
@@ -0,0 +1,135 @@
+name: CMake CI
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: CMake on ${{ matrix.os }} with ${{ matrix.dependencies }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-13, ubuntu-22.04, windows-2019]
+        dependencies: [submodule, vcpkg]
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v4
+        with:
+          submodules: ${{ matrix.dependencies == 'submodule' }}
+
+      - name: Mount vcpkg cache
+        if: matrix.dependencies == 'vcpkg'
+        uses: actions/cache@v4
+        with:
+          path: "~/.cache/vcpkg/archives"
+          key: vcpkg-${{ matrix.os }}
+
+      - name: Default to x64-windows vcpkg triplet
+        if: matrix.dependencies == 'vcpkg' && runner.os == 'Windows'
+        run: echo "VCPKG_DEFAULT_TRIPLET=x64-windows" | Out-File -FilePath $Env:GITHUB_ENV -Encoding utf-8 -Append
+
+      - name: Install vcpkg dependencies
+        if: matrix.dependencies == 'vcpkg'
+        run: vcpkg install benchmark civetweb curl[core] gtest zlib
+
+      - name: Generate German locale on Ubuntu
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get remove -y --purge man-db # avoid time-consuming trigger
+          sudo apt-get update
+          sudo apt-get install -y locales
+          sudo locale-gen de_DE.UTF-8 # used by SerializerTest
+
+      - name: Install ninja on Ubuntu
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get install -y ninja-build
+
+      - name: Install ninja on macOS
+        if: runner.os == 'macOS'
+        run: brew install ninja
+
+      - name: "Configure for Unix with internal dependencies"
+        if: matrix.dependencies == 'submodule' && runner.os != 'Windows'
+        run: cmake -DUSE_THIRDPARTY_LIBRARIES=ON -DCMAKE_INSTALL_PREFIX=${{ github.workspace }}/_install -DENABLE_WARNINGS_AS_ERRORS=ON -DENABLE_COMPRESSION=OFF -DENABLE_PUSH=OFF -DCMAKE_DEBUG_POSTFIX=_d -DCMAKE_CONFIGURATION_TYPES='Release;Debug' -G"Ninja Multi-Config" -S ${{ github.workspace }} -B ${{ github.workspace }}/_build -DBUILD_SHARED_LIBS=ON
+
+      - name: "Configure for Windows with internal dependencies"
+        if: matrix.dependencies == 'submodule' && runner.os == 'Windows'
+        run: cmake -DUSE_THIRDPARTY_LIBRARIES=ON -DCMAKE_INSTALL_PREFIX=${{ github.workspace }}/_install -DENABLE_WARNINGS_AS_ERRORS=ON -DENABLE_COMPRESSION=OFF -DENABLE_PUSH=OFF -DCMAKE_DEBUG_POSTFIX=_d -S ${{ github.workspace }} -B ${{ github.workspace }}/_build  -DBUILD_SHARED_LIBS=ON
+
+      - name: "Configure for Unix with vcpkg dependencies"
+        if: matrix.dependencies == 'vcpkg' && runner.os != 'Windows'
+        run: cmake -DUSE_THIRDPARTY_LIBRARIES=OFF -DCMAKE_INSTALL_PREFIX=${{ github.workspace }}/_install "-DCMAKE_TOOLCHAIN_FILE=${VCPKG_INSTALLATION_ROOT}/scripts/buildsystems/vcpkg.cmake" -DCMAKE_DEBUG_POSTFIX=_d -DCMAKE_CONFIGURATION_TYPES='Release;Debug' -G"Ninja Multi-Config" -S ${{ github.workspace }} -B ${{ github.workspace }}/_build
+
+      - name: "Configure for Windows with vcpkg dependencies"
+        if: matrix.dependencies == 'vcpkg' && runner.os == 'Windows'
+        run: cmake -DUSE_THIRDPARTY_LIBRARIES=OFF -DCMAKE_INSTALL_PREFIX=${{ github.workspace }}/_install "-DCMAKE_TOOLCHAIN_FILE=${Env:VCPKG_INSTALLATION_ROOT}\scripts\buildsystems\vcpkg.cmake" -DCMAKE_DEBUG_POSTFIX=_d -S ${{ github.workspace }} -B ${{ github.workspace }}/_build
+
+      - name: "Build Debug"
+        run: cmake --build ${{ github.workspace }}/_build --config Debug
+
+      - name: "Build Release"
+        run: cmake --build ${{ github.workspace }}/_build --config Release
+
+      - name: "Test Debug"
+        run: ctest -C Debug -V -LE Benchmark
+        working-directory: "${{ github.workspace }}/_build"
+
+      - name: "Test Release"
+        run: ctest -C Release -V -LE Benchmark
+        working-directory: "${{ github.workspace }}/_build"
+
+      - name: "Run Benchmark"
+        run: ctest -C Release -V -L Benchmark
+        working-directory: "${{ github.workspace }}/_build"
+
+      - name: "Install Debug"
+        run: cmake --install ${{ github.workspace }}/_build --config Debug
+
+      - name: "Install Release"
+        run: cmake --install ${{ github.workspace }}/_build --config Release
+
+      - name: "Configure CMake import for Unix with internal dependencies"
+        if: matrix.dependencies == 'submodule' && runner.os != 'Windows'
+        run: cmake -Dprometheus-cpp_DIR=${{ github.workspace }}/_install/lib/cmake/prometheus-cpp -DCMAKE_CONFIGURATION_TYPES='Release;Debug' -G"Ninja Multi-Config" -S ${{ github.workspace }}/cmake/project-import-cmake -B ${{ github.workspace }}/_import_cmake
+
+      - name: "Configure CMake import for Windows with internal dependencies"
+        if: matrix.dependencies == 'submodule' && runner.os == 'Windows'
+        run: cmake -Dprometheus-cpp_DIR=${{ github.workspace }}/_install/lib/cmake/prometheus-cpp -S ${{ github.workspace }}/cmake/project-import-cmake -B ${{ github.workspace }}/_import_cmake
+
+      - name: "Configure CMake import for Unix with vcpkg dependencies"
+        if: matrix.dependencies == 'vcpkg' && runner.os != 'Windows'
+        run: cmake -Dprometheus-cpp_DIR=${{ github.workspace }}/_install/lib/cmake/prometheus-cpp "-DCMAKE_TOOLCHAIN_FILE=${VCPKG_INSTALLATION_ROOT}/scripts/buildsystems/vcpkg.cmake" -DCMAKE_CONFIGURATION_TYPES='Release;Debug' -G"Ninja Multi-Config" -S ${{ github.workspace }}/cmake/project-import-cmake -B ${{ github.workspace }}/_import_cmake
+
+      - name: "Configure CMake import for Windows with vcpkg dependencies"
+        if: matrix.dependencies == 'vcpkg' && runner.os == 'Windows'
+        run: cmake -Dprometheus-cpp_DIR=${{ github.workspace }}/_install/lib/cmake/prometheus-cpp "-DCMAKE_TOOLCHAIN_FILE=${Env:VCPKG_INSTALLATION_ROOT}\scripts\buildsystems\vcpkg.cmake" -S ${{ github.workspace }}/cmake/project-import-cmake -B ${{ github.workspace }}/_import_cmake
+
+      - name: "Build CMake import Debug"
+        run: cmake --build ${{ github.workspace }}/_import_cmake --config Debug
+
+      - name: "Build CMake import Release"
+        run: cmake --build ${{ github.workspace }}/_import_cmake --config Release
+
+      - name: "Configure for Unix Shared Libs with internal dependencies"
+        if: matrix.dependencies == 'submodule' && runner.os != 'Windows'
+        run: cmake -DUSE_THIRDPARTY_LIBRARIES=ON -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=${{ github.workspace }}/_install_shared -DENABLE_WARNINGS_AS_ERRORS=ON -DENABLE_COMPRESSION=OFF -DENABLE_PUSH=OFF -DCMAKE_DEBUG_POSTFIX=_d  -GNinja -S ${{ github.workspace }} -B ${{ github.workspace }}/_build_shared
+
+      - name: "Build for Unix Shared Libs"
+        if: matrix.dependencies == 'submodule' && runner.os != 'Windows'
+        run: cmake --build ${{ github.workspace }}/_build_shared
+
+      - name: "Install for Unix Shared Libs"
+        if: matrix.dependencies == 'submodule' && runner.os != 'Windows'
+        run: cmake --install ${{ github.workspace }}/_build_shared
+
+      - name: "Configure pkg-config import for Unix"
+        if: matrix.dependencies == 'submodule' && runner.os != 'Windows'
+        run: cmake -DCMAKE_PREFIX_PATH=${{ github.workspace }}/_install_shared -GNinja -S ${{ github.workspace }}/cmake/project-import-pkgconfig -B ${{ github.workspace }}/_import_pkgconfig
+
+      - name: "Build pkg-config import for Unix"
+        if: matrix.dependencies == 'submodule' && runner.os != 'Windows'
+        run: cmake --build ${{ github.workspace }}/_import_pkgconfig
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
new file mode 100644
index 00000000..f6bda87d
--- /dev/null
+++ b/.github/workflows/coverage.yml
@@ -0,0 +1,76 @@
+name: Coverage
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Code Coverage
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v4
+
+      - name: Mount vcpkg cache
+        uses: actions/cache@v4
+        with:
+          path: "~/.cache/vcpkg/archives"
+          key: vcpkg-${{ runner.os }}
+
+      - name: Install vcpkg dependencies
+        run: vcpkg install benchmark civetweb curl[core] gtest zlib
+
+      - name: Generate German locale on Ubuntu
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get remove -y --purge man-db # avoid time-consuming trigger
+          sudo apt-get update
+          sudo apt-get install -y locales
+          sudo locale-gen de_DE.UTF-8 # used by SerializerTest
+
+      - name: Install ninja on Ubuntu
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get install -y ninja-build
+
+      - name: Install lcov
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get install -y lcov
+
+      - name: Install lcov 2.3 (which fixes function coverage calculation, https://bugs.launchpad.net/ubuntu/+source/lcov/+bug/2052354)
+        if: runner.os == 'Linux'
+        run: |
+          echo -e "Package: *\nPin: release n=plucky\nPin-Priority: 100" | sudo tee /etc/apt/preferences.d/99-plucky
+          echo "deb http://azure.archive.ubuntu.com/ubuntu/ plucky main universe" | sudo tee /etc/apt/sources.list.d/ubuntu-plucky.list
+          sudo apt-get update
+          sudo apt-get install -y -t plucky lcov
+          apt-cache policy lcov
+
+      - name: "CMake Configure for Unix with vcpkg dependencies"
+        env:
+          CFLAGS: "--coverage"
+          CXXFLAGS: "--coverage"
+          LDFLAGS: "--coverage"
+        run: cmake -DUSE_THIRDPARTY_LIBRARIES=OFF "-DCMAKE_TOOLCHAIN_FILE=${VCPKG_INSTALLATION_ROOT}/scripts/buildsystems/vcpkg.cmake" -GNinja -S ${{ github.workspace }} -B ${{ github.workspace }}/_build
+
+      - name: Build
+        run: cmake --build ${{ github.workspace }}/_build
+
+      - name: Test
+        run: ctest -V -LE Benchmark
+        working-directory: "${{ github.workspace }}/_build"
+
+      - name: Run lcov
+        run: lcov --capture --directory "${{ github.workspace }}" --output-file coverage.info --no-external --exclude '*/tests/*'
+
+      - name: Dump lcov
+        run: lcov --list coverage.info
+
+      - name: Coveralls
+        uses: coverallsapp/github-action@v2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          files: coverage.info
diff --git a/.github/workflows/doxygen.yml b/.github/workflows/doxygen.yml
new file mode 100644
index 00000000..95c78715
--- /dev/null
+++ b/.github/workflows/doxygen.yml
@@ -0,0 +1,30 @@
+name: Doxygen
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Documentation
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v4
+
+      - name: Install doxygen
+        run: |
+          sudo apt-get remove -y --purge man-db # avoid time-consuming trigger
+          sudo apt-get update
+          sudo apt-get install -y doxygen graphviz
+
+      - name: Generate doxygen
+        run: doxygen
+        working-directory: "${{ github.workspace }}/doc"
+
+      - name: Deploy documentation
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          force_orphan: true
+          publish_dir: ./doc/html
diff --git a/.github/workflows/linting.yml b/.github/workflows/linting.yml
new file mode 100644
index 00000000..eb6e5f33
--- /dev/null
+++ b/.github/workflows/linting.yml
@@ -0,0 +1,54 @@
+name: Linting
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  iwyu:
+    name: Include What You Use
+    runs-on: ubuntu-latest
+    container:
+      image: debian:sid-slim
+    steps:
+      - name: Install dependencies
+        run: |
+          apt-get update
+          apt-get install -y --no-install-recommends ca-certificates clang-19 cmake git iwyu libbenchmark-dev libcurl4-openssl-dev ninja-build zlib1g-dev
+
+      - name: Checkout source
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+
+      - name: "CMake Configure"
+        run: cmake -GNinja -DRUN_IWYU=ON -DCMAKE_C_COMPILER=clang-19 -DCMAKE_CXX_COMPILER=clang++-19 -S ${GITHUB_WORKSPACE} -B ${GITHUB_WORKSPACE}/_build
+
+      - name: Build
+        run: cmake --build ${GITHUB_WORKSPACE}/_build 2>&1 | tee ${GITHUB_WORKSPACE}/output.txt
+
+      - name: Check build output
+        run: if egrep -q 'should (add|remove) these lines' ${GITHUB_WORKSPACE}/output.txt; then exit 1; fi
+
+      #- name: "CMake Configure"
+      #  run: cmake -GNinja -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -S ${GITHUB_WORKSPACE} -B ${GITHUB_WORKSPACE}/_build
+
+      #- name: "Run IWYU"
+      #  run: iwyu_tool -p ${GITHUB_WORKSPACE}/_build core push pull -- -Xiwyu --mapping_file=${GITHUB_WORKSPACE}/cmake/googletest.imp -Xiwyu --no_fwd_decls 2>&1 | tee ${{ github.workspace }}/output.txt
+
+  format:
+    name: Clang Format
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v4
+
+      # clang-format comes pre-installed
+      # https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2404-Readme.md
+
+      - name: Run clang-format
+        run: find . -type f \( -name '*.c' -o -name '*.cc' -o -name '*.cpp' -o -name '*.cxx' -o -name '*.o' -o -name '*.h' -o -name '*.hpp' -o -name '*.hxx' \) -exec clang-format-15 -style=file -i {} \;
+
+      - name: Check for changes
+        run: git diff --exit-code
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 00000000..01ad2132
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,34 @@
+on:
+  release:
+    types: [created]
+
+name: Handle Release
+
+jobs:
+  build:
+    name: Upload Release Asset
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+          submodules: true
+
+      - name: Create tarball including submodules
+        shell: bash
+        env:
+          PREFIX: prometheus-cpp-with-submodules
+        run: |
+          git archive --prefix "${PREFIX}/" -o "${PREFIX}.tar" HEAD
+          git submodule foreach --recursive "git archive --prefix=${PREFIX}/\$path/ --output=\$sha1.tar HEAD && tar --concatenate --file=$(pwd)/${PREFIX}.tar \$sha1.tar && rm \$sha1.tar"
+          gzip "${PREFIX}.tar"
+
+      # using the official actions/upload-release-asset action would be preferred but is blocked by
+      # https://github.com/actions/upload-release-asset/pull/41
+      - name: Upload the artifacts
+        uses: skx/github-action-publish-binaries@75ce5546020fc1848da842f40240f9fa03e7a3a8 # release-0.14
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          args: prometheus-cpp-with-submodules.tar.gz
diff --git a/.gitignore b/.gitignore
index 210fb7d9..5267e3b8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,7 @@
-bazel-*
+/bazel-*
 cmake-build-*/
 _*/
 .idea/
+doc/html/
+.vscode
+build
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 7bc449db..00000000
--- a/.travis.yml
+++ /dev/null
@@ -1,82 +0,0 @@
-sudo: required
-dist: trusty
-language: c++
-
-before_install:
-      - echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-
-
-env:
-  global:
-    - secure: "DwlWRs05m1pw3/NprZdVRy3Vog7k+KYIW4O1YQczbKk0t64vYLJMxMh9D8HrngnUv1UDOOU2orEO/hYYjlmiNRqoMA0Me+q9ndqEGjdCvFketH7zYpPXMxV/Uk1E7yYK60CJYbCFK7NossBWlBwSIETUNXXz1MhqF4c7SwDCTQk6ybPUThJVI3/nZLC4Wn9DB4pxPkEZaXJLL3HU0vXH1r0vKRFsjBU0OtDx1KQgtFYVmWbmd7tpxAlDfI11HJjpaoFD6HHcTlwvM5Ogj4lWL8Ze3glJsSsAYntEqgm7GQa4tYWsYmvGC5554WwIQ/0cDsSTLZjk2+FtSGmJpxdwXwmfOzzVjt7Ise7KG2Zg+CZ/IwF9VpwP2xmH/ug926sJDIjMmehZx2eetDzwY3oB3g3AF+JJIoaDF14Skt6QXEFWm/s/PiSQwkenMF80xzUufB7CRCVLR054HfJsQ0m5O8bNtUjyH7byZwOjvz8t/VdlnfFn5Ccs4tniOK6iiwvKmGAaakv6pfA7xKpRbExFkgPoTmejeQX83Ee1/A4JySMPTxkHPsJbMhimpMdbLVJTh9mKJxo2kleCC0MKB7OwTyNwUdR8+nqoZpUknGX6BrGY+R6ou3xlNYRUM9LCxxBKBJB05CswbhRWroun9fbpDTzBz3XPwBjiVTlxUc/YnXA="
-    - secure: "fg0cACBBm7NAjad4Pxhp9DeTGDbcLnD0U9uxclsioTcB5X+88sTsgKRr5gG0hajPG6QF0L8iNt7zp87eZNcSU7JlTWnCBHPAAADD2apFnPUhioth+vPUBsUiKdOksoEG1q/hrjMYQ6yAf3XXd0+/ZaUA1X5v0OA2rjMTpNpNvMaQEN7M3XvcLRr1ydaAD/Wc1PAbuK8owWU3Hyo7+GdxoUWOtYiH44OuHSlSlnVQw2/yRR53yM1StKLZ2xarsWviXr76e1PutqoeeTbBbpAU6xboiyyDVey4Ae83HfOgPiADtsE4UjE2pqX2oqponY2q+0j8kI7sZVODR20nLCKcq9RHJR+yi0JEpsrqC4SE0lPKxG8HHlDaH+NdRVHTdNYuCfENR0R4YX/K59I83kLEnLNpC+j1BzXiRBjYzAMl5UtEDCUQGJcixq6BxE7i1uwskPckmYi2K63TaIxj5nvVm4Um8aHPrWHtbAf4stTDQHcFGcfQeBbX7PswKJAyIljaHn5T7kwAatRuWLHGsVTuxTkhkYohZy+/SDhFakI+6jfz8XZtL8gOIGMnDuvDWT2Di1JPZkBLcKKWpCIXdDaJnTogNid9xBpsX5IMVmlS51FxCOkoIT62gc9Lo+rxwgqFvEe+QIQh2zd8OjgS5m5HsftxCKVCbcPr+RjsNsCyOnQ="
-
-os:
-  - linux
-  - osx
-
-addons:
-  apt:
-    sources:
-    - sourceline: 'deb [arch=amd64] http://storage.googleapis.com/bazel-apt stable jdk1.8'
-      key_url: 'https://storage.googleapis.com/bazel-apt/doc/apt-key.pub.gpg'
-    - sourceline: 'deb https://repos.influxdata.com/ubuntu trusty stable'
-      key_url: 'https://repos.influxdata.com/influxdb.key'
-    packages:
-    - bazel
-    - cmake3
-    - curl
-    - g++-4.8
-    - gcc-4.8
-    - git
-    - lcov
-    - libcurl4-openssl-dev
-    - openjdk-8-jdk-headless
-    - python-pip
-    - telegraf
-  homebrew:
-    packages:
-    - cmake
-    - bazelbuild/tap/bazel
-    - prometheus
-    - telegraf
-    taps:
-    - bazelbuild/tap
-
-script:
-  - bazel build //...
-  - bazel test --test_output=all //core/... //pull/...
-  - bazel test --test_output=all //pull/tests/integration:scrape-test
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then bazel test --test_output=all //pull/tests/integration:lint-test; fi
-  - bazel run -c opt //core/benchmarks
-
-  - pushd .
-  - mkdir _build_internal_deps
-  - cd _build_internal_deps
-  - cmake .. -DUSE_THIRDPARTY_LIBRARIES=ON
-  - make -j 4
-  - ctest -V
-  - mkdir -p deploy
-  - make DESTDIR=`pwd`/deploy install
-  - popd
-
-  - 3rdparty/build_for_travis.sh
-  - rm -rf 3rdparty/*
-
-  - pushd .
-  - mkdir _build_external_deps
-  - cd _build_external_deps
-  - cmake .. -DCMAKE_INSTALL_PREFIX=../_opt -DUSE_THIRDPARTY_LIBRARIES=OFF
-  - make -j 4
-  - ctest -V
-  - mkdir -p deploy
-  - make DESTDIR=`pwd`/deploy install
-  - popd
-
-# addons:
-#   coverity_scan:
-#     project:
-#       name: "jupp0r/prometheus-cpp"
-#     notification_email: jupp0r@gmail.com
-#     build_command_prepend: ""
-#     build_command:   "bazel build --spawn_strategy=standalone //lib:all"
-#     branch_pattern:  "master"
diff --git a/3rdparty/build_for_travis.sh b/3rdparty/build_for_travis.sh
deleted file mode 100755
index da895bb7..00000000
--- a/3rdparty/build_for_travis.sh
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/bin/bash
-
-set -euo pipefail
-
-THIRDPARTY_ROOT=$(cd $(dirname "${BASH_SOURCE[0]}") && /bin/pwd -P)
-INSTALL_PREFIX="${TRAVIS_BUILD_DIR:?}/_opt"
-
-mkdir "${THIRDPARTY_ROOT}/civetweb/_build"
-cd "${THIRDPARTY_ROOT}/civetweb/_build"
-cmake  .. -DCMAKE_INSTALL_PREFIX="${INSTALL_PREFIX}" -DCIVETWEB_ENABLE_CXX=ON -DCIVETWEB_ENABLE_SSL=OFF -DCIVETWEB_BUILD_TESTING=OFF
-make -j4
-make install
-
-mkdir "${THIRDPARTY_ROOT}/googletest/_build"
-cd "${THIRDPARTY_ROOT}/googletest/_build"
-cmake  .. -DCMAKE_INSTALL_PREFIX="${INSTALL_PREFIX}"
-make -j4
-make install
diff --git a/3rdparty/civetweb b/3rdparty/civetweb
index ce8f6d38..d7ba35bb 160000
--- a/3rdparty/civetweb
+++ b/3rdparty/civetweb
@@ -1 +1 @@
-Subproject commit ce8f6d38a60eb16c996afee1e5340f76ef4d0923
+Subproject commit d7ba35bbb649209c66e582d5a0244ba988a15159
diff --git a/3rdparty/googletest b/3rdparty/googletest
index 2fe3bd99..e2239ee6 160000
--- a/3rdparty/googletest
+++ b/3rdparty/googletest
@@ -1 +1 @@
-Subproject commit 2fe3bd994b3189899d93f1d5a881e725e046fdc2
+Subproject commit e2239ee6043f73722e7aa812a459f54a28552929
diff --git a/BUILD.bazel b/BUILD.bazel
index 068e469a..ffd0fb0c 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -1,11 +1 @@
 package(default_visibility = ["//visibility:public"])
-
-config_setting(
-    name = "windows",
-    values = {"cpu": "x64_windows"},
-)
-
-config_setting(
-    name = "windows_msvc",
-    values = {"cpu": "x64_windows_msvc"},
-)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f5fab8b0..949c1464 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,47 +1,131 @@
 
-cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+if(POLICY CMP0091)
+  cmake_policy(SET CMP0091 NEW) # recognize CMAKE_MSVC_RUNTIME_LIBRARY
+endif()
 
-project(prometheus-cpp)
+project(prometheus-cpp
+  VERSION 1.3.0
+  DESCRIPTION "Prometheus Client Library for Modern C++"
+  HOMEPAGE_URL "https://github.com/jupp0r/prometheus-cpp"
+)
 
+include(GenerateExportHeader)
 include(GNUInstallDirs)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 list(APPEND CMAKE_PREFIX_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
+option(BUILD_SHARED_LIBS "Build libraries as shared ones" OFF)
 option(ENABLE_PULL "Build prometheus-cpp pull library" ON)
 option(ENABLE_PUSH "Build prometheus-cpp push library" ON)
 option(ENABLE_COMPRESSION "Enable gzip compression" ON)
 option(ENABLE_TESTING "Build tests" ON)
 option(USE_THIRDPARTY_LIBRARIES "Use 3rdParty submodules" ON)
-option(OVERRIDE_CXX_STANDARD_FLAGS "Force building with -std=c++11 even if the CXXLFAGS are configured differently" ON)
+option(THIRDPARTY_CIVETWEB_WITH_SSL "Enable SSL support for embedded civetweb source code")
+option(OVERRIDE_CXX_STANDARD_FLAGS "Force building with -std=c++11 even if the CXXFLAGS are configured differently" ON)
+option(GENERATE_PKGCONFIG "Generate and install pkg-config files" ${UNIX})
+option(RUN_IWYU "Run include-what-you-use" OFF)
 
 if(OVERRIDE_CXX_STANDARD_FLAGS)
   set(CMAKE_CXX_STANDARD 11)
   set(CMAKE_CXX_EXTENSIONS Off)
 endif()
 
+# Set default directory permissions until
+# https://gitlab.kitware.com/cmake/cmake/issues/15163
+# is fixed
+set(CMAKE_INSTALL_DEFAULT_DIRECTORY_PERMISSIONS
+    OWNER_READ
+    OWNER_WRITE
+    OWNER_EXECUTE
+    GROUP_READ
+    GROUP_EXECUTE
+    WORLD_READ
+    WORLD_EXECUTE)
+
+# Put DLLs and binaries into same directory
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/bin)
+
+# Hide things by default for shared libraries
+if(BUILD_SHARED_LIBS)
+  set(CMAKE_C_VISIBILITY_PRESET hidden)
+  set(CMAKE_CXX_VISIBILITY_PRESET hidden)
+  set(CMAKE_VISIBILITY_INLINES_HIDDEN YES)
+endif()
+
 set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
 find_package(Threads)
 
+# include-what-you-use
+
+if(RUN_IWYU)
+  find_program(IWYU_EXECUTABLE NAMES include-what-you-use iwyu)
+  if(NOT IWYU_EXECUTABLE)
+    message(FATAL_ERROR "Include-what-you-use not found")
+  endif()
+
+  set(IWYU_ARGS
+    "${IWYU_EXECUTABLE}"
+    "-Xiwyu" "--no_fwd_decls"
+    "-Xiwyu" "--mapping_file=${CMAKE_CURRENT_SOURCE_DIR}/cmake/googletest.imp"
+  )
+
+  set(CMAKE_C_INCLUDE_WHAT_YOU_USE ${IWYU_ARGS})
+  set(CMAKE_CXX_INCLUDE_WHAT_YOU_USE ${IWYU_ARGS})
+endif()
+
+# check for required libatomic
+
+include(CheckAtomic)
+
 if(ENABLE_TESTING)
   if(USE_THIRDPARTY_LIBRARIES)
     find_package(googlemock-3rdparty CONFIG REQUIRED)
   else()
     find_package(GTest 1.8.1 CONFIG REQUIRED)
   endif()
-  find_package(GoogleBenchmark)
+  find_package(benchmark CONFIG)
   enable_testing()
 endif()
 
-# suppress warnings
+# build flags for CI system
+
+if(ENABLE_WARNINGS_AS_ERRORS AND NOT MSVC)
+  add_compile_options(
+    $<$<AND:$<STREQUAL:$<COMPILE_LANGUAGE>,CXX>,$<CXX_COMPILER_ID:AppleClang>>:-Werror>
+    $<$<AND:$<STREQUAL:$<COMPILE_LANGUAGE>,CXX>,$<CXX_COMPILER_ID:AppleClang>>:-Wall>
+    $<$<AND:$<STREQUAL:$<COMPILE_LANGUAGE>,CXX>,$<CXX_COMPILER_ID:AppleClang>>:-Wextra>
+    $<$<AND:$<STREQUAL:$<COMPILE_LANGUAGE>,CXX>,$<CXX_COMPILER_ID:AppleClang>>:-pedantic-errors>
+    $<$<AND:$<STREQUAL:$<COMPILE_LANGUAGE>,CXX>,$<CXX_COMPILER_ID:GNU>>:-Werror>
+    $<$<AND:$<STREQUAL:$<COMPILE_LANGUAGE>,CXX>,$<CXX_COMPILER_ID:GNU>>:-Wall>
+    $<$<AND:$<STREQUAL:$<COMPILE_LANGUAGE>,CXX>,$<CXX_COMPILER_ID:GNU>>:-pedantic-errors>
+  )
+endif()
+
+# pkgconfig
 
-add_compile_options(
-  $<$<AND:$<STREQUAL:$<COMPILE_LANGUAGE>,CXX>,$<CXX_COMPILER_ID:AppleClang>>:-Wno-deprecated-declarations>
-)
+if(GENERATE_PKGCONFIG)
+  # see https://github.com/jupp0r/prometheus-cpp/issues/587
+  if(IS_ABSOLUTE "${CMAKE_INSTALL_INCLUDEDIR}")
+    set(PROMETHEUS_CPP_PKGCONFIG_INCLUDEDIR "${CMAKE_INSTALL_INCLUDEDIR}")
+  else()
+    set(PROMETHEUS_CPP_PKGCONFIG_INCLUDEDIR "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
+  endif()
+
+  if(IS_ABSOLUTE "${CMAKE_INSTALL_LIBDIR}")
+    set(PROMETHEUS_CPP_PKGCONFIG_LIBDIR "${CMAKE_INSTALL_LIBDIR}")
+  else()
+    set(PROMETHEUS_CPP_PKGCONFIG_LIBDIR "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}")
+  endif()
+endif()
 
 # prometheus-cpp
 
 add_subdirectory(core)
+add_subdirectory(util)
 
 if(ENABLE_PULL)
   add_subdirectory(pull)
@@ -62,6 +146,12 @@ install(
   DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
 )
 
+write_basic_package_version_file(
+  "${PROJECT_NAME}-config-version.cmake"
+  VERSION ${PROJECT_VERSION}
+  COMPATIBILITY SameMajorVersion
+)
+
 configure_package_config_file(
   "${CMAKE_CURRENT_SOURCE_DIR}/cmake/${PROJECT_NAME}-config.cmake.in"
   ${PROJECT_NAME}-config.cmake
@@ -71,6 +161,40 @@ configure_package_config_file(
 )
 
 install(
-  FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake"
+  FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake" "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config-version.cmake"
   DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
 )
+
+# packaging
+
+if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
+  set(CPACK_PACKAGE_CONTACT "prometheus-cpp@@noreply.github.com")
+  set(CPACK_PACKAGE_DESCRIPTION "${PROJECT_DESCRIPTION}")
+  set(CPACK_PACKAGE_RELOCATABLE OFF)
+  set(CPACK_PACKAGE_VENDOR "The prometheus-cpp authors")
+
+  if(CMAKE_VERSION VERSION_LESS "3.12")
+    set(CPACK_PACKAGE_VERSION_MAJOR "${PROJECT_VERSION_MAJOR}")
+    set(CPACK_PACKAGE_VERSION_MINOR "${PROJECT_VERSION_MINOR}")
+    set(CPACK_PACKAGE_VERSION_PATCH "${PROJECT_VERSION_PATCH}")
+  endif()
+
+  set(CPACK_DEBIAN_PACKAGE_GENERATE_SHLIBS ON)
+  set(CPACK_DEBIAN_PACKAGE_SHLIBDEPS ON)
+  set(CPACK_DEBIAN_FILE_NAME DEB-DEFAULT)
+
+  set(CPACK_RPM_PACKAGE_AUTOREQPROV ON)
+  set(CPACK_RPM_FILE_NAME RPM-DEFAULT)
+
+  include(CPack)
+endif()
+
+# summary
+
+include(FeatureSummary)
+add_feature_info("Pull" "${ENABLE_PULL}" "support for pulling metrics")
+add_feature_info("Push" "${ENABLE_PUSH}" "support for pushing metrics to a push-gateway")
+add_feature_info("Compression" "${ENABLE_COMPRESSION}" "support for zlib compression of metrics")
+add_feature_info("pkg-config" "${GENERATE_PKGCONFIG}" "generate pkg-config files")
+add_feature_info("IYWU" "${RUN_IWYU}" "include-what-you-use")
+feature_summary(WHAT ALL)
diff --git a/LICENSE b/LICENSE
index 8aa26455..e57e4251 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,10 @@
 MIT License
 
-Copyright (c) [year] [fullname]
+Copyright (c) 2016-2021 Jupp Mueller
+Copyright (c) 2017-2022 Gregor Jasny
+
+And many contributors, see
+https://github.com/jupp0r/prometheus-cpp/graphs/contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/MODULE.bazel b/MODULE.bazel
new file mode 100644
index 00000000..107926dd
--- /dev/null
+++ b/MODULE.bazel
@@ -0,0 +1,20 @@
+module(
+    name = "prometheus-cpp",
+    version = "1.3.0",
+    repo_name = "com_github_jupp0r_prometheus_cpp",
+)
+
+bazel_dep(name = "boringssl", version = "0.20250311.0")
+bazel_dep(name = "civetweb", version = "1.16.bcr.1")
+bazel_dep(name = "curl", version = "8.8.0.bcr.3")
+bazel_dep(name = "platforms", version = "0.0.11")
+bazel_dep(name = "rules_cc", version = "0.1.1")
+bazel_dep(name = "zlib", version = "1.3.1.bcr.5")
+
+bazel_dep(name = "google_benchmark", version = "1.9.1", dev_dependency = True)
+bazel_dep(name = "googletest", version = "1.16.0", dev_dependency = True)
+
+# due to
+#   https://github.com/bazelbuild/bazel/issues/24426
+#   https://github.com/bazelbuild/bazel-central-registry/pull/3320
+bazel_dep(name = "re2", version = "2024-07-02.bcr.1")
diff --git a/MODULE.bazel.lock b/MODULE.bazel.lock
new file mode 100644
index 00000000..d170d360
--- /dev/null
+++ b/MODULE.bazel.lock
@@ -0,0 +1,3287 @@
+{
+  "lockFileVersion": 18,
+  "registryFileHashes": {
+    "https://bcr.bazel.build/bazel_registry.json": "8a28e4aff06ee60aed2a8c281907fb8bcbf3b753c91fb5a5c57da3215d5b3497",
+    "https://bcr.bazel.build/modules/abseil-cpp/20210324.2/MODULE.bazel": "7cd0312e064fde87c8d1cd79ba06c876bd23630c83466e9500321be55c96ace2",
+    "https://bcr.bazel.build/modules/abseil-cpp/20211102.0/MODULE.bazel": "70390338f7a5106231d20620712f7cccb659cd0e9d073d1991c038eb9fc57589",
+    "https://bcr.bazel.build/modules/abseil-cpp/20230125.1/MODULE.bazel": "89047429cb0207707b2dface14ba7f8df85273d484c2572755be4bab7ce9c3a0",
+    "https://bcr.bazel.build/modules/abseil-cpp/20230802.0.bcr.1/MODULE.bazel": "1c8cec495288dccd14fdae6e3f95f772c1c91857047a098fad772034264cc8cb",
+    "https://bcr.bazel.build/modules/abseil-cpp/20230802.0/MODULE.bazel": "d253ae36a8bd9ee3c5955384096ccb6baf16a1b1e93e858370da0a3b94f77c16",
+    "https://bcr.bazel.build/modules/abseil-cpp/20230802.1/MODULE.bazel": "fa92e2eb41a04df73cdabeec37107316f7e5272650f81d6cc096418fe647b915",
+    "https://bcr.bazel.build/modules/abseil-cpp/20240116.1/MODULE.bazel": "37bcdb4440fbb61df6a1c296ae01b327f19e9bb521f9b8e26ec854b6f97309ed",
+    "https://bcr.bazel.build/modules/abseil-cpp/20240116.2/MODULE.bazel": "73939767a4686cd9a520d16af5ab440071ed75cec1a876bf2fcfaf1f71987a16",
+    "https://bcr.bazel.build/modules/abseil-cpp/20250127.0/MODULE.bazel": "d1086e248cda6576862b4b3fe9ad76a214e08c189af5b42557a6e1888812c5d5",
+    "https://bcr.bazel.build/modules/abseil-cpp/20250127.0/source.json": "1b996859f840d8efc7c720efc61dcf2a84b1261cb3974cbbe9b6666ebf567775",
+    "https://bcr.bazel.build/modules/apple_support/1.15.1/MODULE.bazel": "a0556fefca0b1bb2de8567b8827518f94db6a6e7e7d632b4c48dc5f865bc7c85",
+    "https://bcr.bazel.build/modules/apple_support/1.15.1/source.json": "517f2b77430084c541bc9be2db63fdcbb7102938c5f64c17ee60ffda2e5cf07b",
+    "https://bcr.bazel.build/modules/bazel_features/1.1.1/MODULE.bazel": "27b8c79ef57efe08efccbd9dd6ef70d61b4798320b8d3c134fd571f78963dbcd",
+    "https://bcr.bazel.build/modules/bazel_features/1.11.0/MODULE.bazel": "f9382337dd5a474c3b7d334c2f83e50b6eaedc284253334cf823044a26de03e8",
+    "https://bcr.bazel.build/modules/bazel_features/1.15.0/MODULE.bazel": "d38ff6e517149dc509406aca0db3ad1efdd890a85e049585b7234d04238e2a4d",
+    "https://bcr.bazel.build/modules/bazel_features/1.17.0/MODULE.bazel": "039de32d21b816b47bd42c778e0454217e9c9caac4a3cf8e15c7231ee3ddee4d",
+    "https://bcr.bazel.build/modules/bazel_features/1.18.0/MODULE.bazel": "1be0ae2557ab3a72a57aeb31b29be347bcdc5d2b1eb1e70f39e3851a7e97041a",
+    "https://bcr.bazel.build/modules/bazel_features/1.19.0/MODULE.bazel": "59adcdf28230d220f0067b1f435b8537dd033bfff8db21335ef9217919c7fb58",
+    "https://bcr.bazel.build/modules/bazel_features/1.21.0/MODULE.bazel": "675642261665d8eea09989aa3b8afb5c37627f1be178382c320d1b46afba5e3b",
+    "https://bcr.bazel.build/modules/bazel_features/1.21.0/source.json": "3e8379efaaef53ce35b7b8ba419df829315a880cb0a030e5bb45c96d6d5ecb5f",
+    "https://bcr.bazel.build/modules/bazel_features/1.4.1/MODULE.bazel": "e45b6bb2350aff3e442ae1111c555e27eac1d915e77775f6fdc4b351b758b5d7",
+    "https://bcr.bazel.build/modules/bazel_features/1.9.1/MODULE.bazel": "8f679097876a9b609ad1f60249c49d68bfab783dd9be012faf9d82547b14815a",
+    "https://bcr.bazel.build/modules/bazel_skylib/1.0.3/MODULE.bazel": "bcb0fd896384802d1ad283b4e4eb4d718eebd8cb820b0a2c3a347fb971afd9d8",
+    "https://bcr.bazel.build/modules/bazel_skylib/1.1.1/MODULE.bazel": "1add3e7d93ff2e6998f9e118022c84d163917d912f5afafb3058e3d2f1545b5e",
+    "https://bcr.bazel.build/modules/bazel_skylib/1.2.0/MODULE.bazel": "44fe84260e454ed94ad326352a698422dbe372b21a1ac9f3eab76eb531223686",
+    "https://bcr.bazel.build/modules/bazel_skylib/1.2.1/MODULE.bazel": "f35baf9da0efe45fa3da1696ae906eea3d615ad41e2e3def4aeb4e8bc0ef9a7a",
+    "https://bcr.bazel.build/modules/bazel_skylib/1.3.0/MODULE.bazel": "20228b92868bf5cfc41bda7afc8a8ba2a543201851de39d990ec957b513579c5",
+    "https://bcr.bazel.build/modules/bazel_skylib/1.4.1/MODULE.bazel": "a0dcb779424be33100dcae821e9e27e4f2901d9dfd5333efe5ac6a8d7ab75e1d",
+    "https://bcr.bazel.build/modules/bazel_skylib/1.4.2/MODULE.bazel": "3bd40978e7a1fac911d5989e6b09d8f64921865a45822d8b09e815eaa726a651",
+    "https://bcr.bazel.build/modules/bazel_skylib/1.5.0/MODULE.bazel": "32880f5e2945ce6a03d1fbd588e9198c0a959bb42297b2cfaf1685b7bc32e138",
+    "https://bcr.bazel.build/modules/bazel_skylib/1.6.1/MODULE.bazel": "8fdee2dbaace6c252131c00e1de4b165dc65af02ea278476187765e1a617b917",
+    "https://bcr.bazel.build/modules/bazel_skylib/1.7.0/MODULE.bazel": "0db596f4563de7938de764cc8deeabec291f55e8ec15299718b93c4423e9796d",
+    "https://bcr.bazel.build/modules/bazel_skylib/1.7.1/MODULE.bazel": "3120d80c5861aa616222ec015332e5f8d3171e062e3e804a2a0253e1be26e59b",
+    "https://bcr.bazel.build/modules/bazel_skylib/1.7.1/source.json": "f121b43eeefc7c29efbd51b83d08631e2347297c95aac9764a701f2a6a2bb953",
+    "https://bcr.bazel.build/modules/boringssl/0.0.0-20230215-5c22014/MODULE.bazel": "4b03dc0d04375fa0271174badcd202ed249870c8e895b26664fd7298abea7282",
+    "https://bcr.bazel.build/modules/boringssl/0.20241024.0/MODULE.bazel": "b540cff73d948cb79cb0bc108d7cef391d2098a25adabfda5043e4ef548dbc87",
+    "https://bcr.bazel.build/modules/boringssl/0.20250311.0/MODULE.bazel": "7f3e225bc7c5db64de9eaf1a4616f71cf534eaec287550e974dd8967d280698d",
+    "https://bcr.bazel.build/modules/boringssl/0.20250311.0/source.json": "8e92cddf8d6193b273046a76b3b4818a39028f6bfe42db7057eda421e7e908f2",
+    "https://bcr.bazel.build/modules/buildozer/7.1.2/MODULE.bazel": "2e8dd40ede9c454042645fd8d8d0cd1527966aa5c919de86661e62953cd73d84",
+    "https://bcr.bazel.build/modules/buildozer/7.1.2/source.json": "c9028a501d2db85793a6996205c8de120944f50a0d570438fcae0457a5f9d1f8",
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+                "nh3": "[{\"filename\":\"nh3-0.2.18-cp37-abi3-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl\",\"repo\":\"rules_python_publish_deps_311_nh3_cp37_abi3_macosx_10_12_x86_64_14c5a72e\",\"version\":\"3.11\"},{\"filename\":\"nh3-0.2.18-cp37-abi3-macosx_10_12_x86_64.whl\",\"repo\":\"rules_python_publish_deps_311_nh3_cp37_abi3_macosx_10_12_x86_64_7b7c2a3c\",\"version\":\"3.11\"},{\"filename\":\"nh3-0.2.18-cp37-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl\",\"repo\":\"rules_python_publish_deps_311_nh3_cp37_abi3_manylinux_2_17_aarch64_42c64511\",\"version\":\"3.11\"},{\"filename\":\"nh3-0.2.18-cp37-abi3-manylinux_2_17_armv7l.manylinux2014_armv7l.whl\",\"repo\":\"rules_python_publish_deps_311_nh3_cp37_abi3_manylinux_2_17_armv7l_0411beb0\",\"version\":\"3.11\"},{\"filename\":\"nh3-0.2.18-cp37-abi3-manylinux_2_17_ppc64.manylinux2014_ppc64.whl\",\"repo\":\"rules_python_publish_deps_311_nh3_cp37_abi3_manylinux_2_17_ppc64_5f36b271\",\"version\":\"3.11\"},{\"filename\":\"nh3-0.2.18-cp37-abi3-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl\",\"repo\":\"rules_python_publish_deps_311_nh3_cp37_abi3_manylinux_2_17_ppc64le_34c03fa7\",\"version\":\"3.11\"},{\"filename\":\"nh3-0.2.18-cp37-abi3-manylinux_2_17_s390x.manylinux2014_s390x.whl\",\"repo\":\"rules_python_publish_deps_311_nh3_cp37_abi3_manylinux_2_17_s390x_19aaba96\",\"version\":\"3.11\"},{\"filename\":\"nh3-0.2.18-cp37-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl\",\"repo\":\"rules_python_publish_deps_311_nh3_cp37_abi3_manylinux_2_17_x86_64_de3ceed6\",\"version\":\"3.11\"},{\"filename\":\"nh3-0.2.18-cp37-abi3-musllinux_1_2_aarch64.whl\",\"repo\":\"rules_python_publish_deps_311_nh3_cp37_abi3_musllinux_1_2_aarch64_f0eca9ca\",\"version\":\"3.11\"},{\"filename\":\"nh3-0.2.18-cp37-abi3-musllinux_1_2_armv7l.whl\",\"repo\":\"rules_python_publish_deps_311_nh3_cp37_abi3_musllinux_1_2_armv7l_3a157ab1\",\"version\":\"3.11\"},{\"filename\":\"nh3-0.2.18-cp37-abi3-musllinux_1_2_x86_64.whl\",\"repo\":\"rules_python_publish_deps_311_nh3_cp37_abi3_musllinux_1_2_x86_64_36c95d4b\",\"version\":\"3.11\"},{\"filename\":\"nh3-0.2.18-cp37-abi3-win_amd64.whl\",\"repo\":\"rules_python_publish_deps_311_nh3_cp37_abi3_win_amd64_8ce0f819\",\"version\":\"3.11\"},{\"filename\":\"nh3-0.2.18.tar.gz\",\"repo\":\"rules_python_publish_deps_311_nh3_sdist_94a16692\",\"version\":\"3.11\"}]",
+                "pkginfo": "[{\"filename\":\"pkginfo-1.10.0-py3-none-any.whl\",\"repo\":\"rules_python_publish_deps_311_pkginfo_py3_none_any_889a6da2\",\"version\":\"3.11\"},{\"filename\":\"pkginfo-1.10.0.tar.gz\",\"repo\":\"rules_python_publish_deps_311_pkginfo_sdist_5df73835\",\"version\":\"3.11\"}]",
+                "pycparser": "[{\"filename\":\"pycparser-2.22-py3-none-any.whl\",\"repo\":\"rules_python_publish_deps_311_pycparser_py3_none_any_c3702b6d\",\"version\":\"3.11\"},{\"filename\":\"pycparser-2.22.tar.gz\",\"repo\":\"rules_python_publish_deps_311_pycparser_sdist_491c8be9\",\"version\":\"3.11\"}]",
+                "pygments": "[{\"filename\":\"pygments-2.18.0-py3-none-any.whl\",\"repo\":\"rules_python_publish_deps_311_pygments_py3_none_any_b8e6aca0\",\"version\":\"3.11\"},{\"filename\":\"pygments-2.18.0.tar.gz\",\"repo\":\"rules_python_publish_deps_311_pygments_sdist_786ff802\",\"version\":\"3.11\"}]",
+                "pywin32_ctypes": "[{\"filename\":\"pywin32-ctypes-0.2.3.tar.gz\",\"repo\":\"rules_python_publish_deps_311_pywin32_ctypes_sdist_d162dc04\",\"version\":\"3.11\"},{\"filename\":\"pywin32_ctypes-0.2.3-py3-none-any.whl\",\"repo\":\"rules_python_publish_deps_311_pywin32_ctypes_py3_none_any_8a151337\",\"version\":\"3.11\"}]",
+                "readme_renderer": "[{\"filename\":\"readme_renderer-44.0-py3-none-any.whl\",\"repo\":\"rules_python_publish_deps_311_readme_renderer_py3_none_any_2fbca89b\",\"version\":\"3.11\"},{\"filename\":\"readme_renderer-44.0.tar.gz\",\"repo\":\"rules_python_publish_deps_311_readme_renderer_sdist_8712034e\",\"version\":\"3.11\"}]",
+                "requests": "[{\"filename\":\"requests-2.32.3-py3-none-any.whl\",\"repo\":\"rules_python_publish_deps_311_requests_py3_none_any_70761cfe\",\"version\":\"3.11\"},{\"filename\":\"requests-2.32.3.tar.gz\",\"repo\":\"rules_python_publish_deps_311_requests_sdist_55365417\",\"version\":\"3.11\"}]",
+                "requests_toolbelt": "[{\"filename\":\"requests-toolbelt-1.0.0.tar.gz\",\"repo\":\"rules_python_publish_deps_311_requests_toolbelt_sdist_7681a0a3\",\"version\":\"3.11\"},{\"filename\":\"requests_toolbelt-1.0.0-py2.py3-none-any.whl\",\"repo\":\"rules_python_publish_deps_311_requests_toolbelt_py2_none_any_cccfdd66\",\"version\":\"3.11\"}]",
+                "rfc3986": "[{\"filename\":\"rfc3986-2.0.0-py2.py3-none-any.whl\",\"repo\":\"rules_python_publish_deps_311_rfc3986_py2_none_any_50b1502b\",\"version\":\"3.11\"},{\"filename\":\"rfc3986-2.0.0.tar.gz\",\"repo\":\"rules_python_publish_deps_311_rfc3986_sdist_97aacf9d\",\"version\":\"3.11\"}]",
+                "rich": "[{\"filename\":\"rich-13.9.3-py3-none-any.whl\",\"repo\":\"rules_python_publish_deps_311_rich_py3_none_any_9836f509\",\"version\":\"3.11\"},{\"filename\":\"rich-13.9.3.tar.gz\",\"repo\":\"rules_python_publish_deps_311_rich_sdist_bc1e01b8\",\"version\":\"3.11\"}]",
+                "secretstorage": "[{\"filename\":\"SecretStorage-3.3.3-py3-none-any.whl\",\"repo\":\"rules_python_publish_deps_311_secretstorage_py3_none_any_f356e662\",\"version\":\"3.11\"},{\"filename\":\"SecretStorage-3.3.3.tar.gz\",\"repo\":\"rules_python_publish_deps_311_secretstorage_sdist_2403533e\",\"version\":\"3.11\"}]",
+                "twine": "[{\"filename\":\"twine-5.1.1-py3-none-any.whl\",\"repo\":\"rules_python_publish_deps_311_twine_py3_none_any_215dbe7b\",\"version\":\"3.11\"},{\"filename\":\"twine-5.1.1.tar.gz\",\"repo\":\"rules_python_publish_deps_311_twine_sdist_9aa08251\",\"version\":\"3.11\"}]",
+                "urllib3": "[{\"filename\":\"urllib3-2.2.3-py3-none-any.whl\",\"repo\":\"rules_python_publish_deps_311_urllib3_py3_none_any_ca899ca0\",\"version\":\"3.11\"},{\"filename\":\"urllib3-2.2.3.tar.gz\",\"repo\":\"rules_python_publish_deps_311_urllib3_sdist_e7d814a8\",\"version\":\"3.11\"}]",
+                "zipp": "[{\"filename\":\"zipp-3.20.2-py3-none-any.whl\",\"repo\":\"rules_python_publish_deps_311_zipp_py3_none_any_a817ac80\",\"version\":\"3.11\"},{\"filename\":\"zipp-3.20.2.tar.gz\",\"repo\":\"rules_python_publish_deps_311_zipp_sdist_bc9eb26f\",\"version\":\"3.11\"}]"
+              },
+              "packages": [
+                "backports_tarfile",
+                "certifi",
+                "charset_normalizer",
+                "docutils",
+                "idna",
+                "importlib_metadata",
+                "jaraco_classes",
+                "jaraco_context",
+                "jaraco_functools",
+                "keyring",
+                "markdown_it_py",
+                "mdurl",
+                "more_itertools",
+                "nh3",
+                "pkginfo",
+                "pygments",
+                "readme_renderer",
+                "requests",
+                "requests_toolbelt",
+                "rfc3986",
+                "rich",
+                "twine",
+                "urllib3",
+                "zipp"
+              ],
+              "groups": {}
+            }
+          }
+        },
+        "recordedRepoMappingEntries": [
+          [
+            "bazel_features+",
+            "bazel_features_globals",
+            "bazel_features++version_extension+bazel_features_globals"
+          ],
+          [
+            "bazel_features+",
+            "bazel_features_version",
+            "bazel_features++version_extension+bazel_features_version"
+          ],
+          [
+            "rules_python+",
+            "bazel_features",
+            "bazel_features+"
+          ],
+          [
+            "rules_python+",
+            "bazel_skylib",
+            "bazel_skylib+"
+          ],
+          [
+            "rules_python+",
+            "bazel_tools",
+            "bazel_tools"
+          ],
+          [
+            "rules_python+",
+            "pypi__build",
+            "rules_python++internal_deps+pypi__build"
+          ],
+          [
+            "rules_python+",
+            "pypi__click",
+            "rules_python++internal_deps+pypi__click"
+          ],
+          [
+            "rules_python+",
+            "pypi__colorama",
+            "rules_python++internal_deps+pypi__colorama"
+          ],
+          [
+            "rules_python+",
+            "pypi__importlib_metadata",
+            "rules_python++internal_deps+pypi__importlib_metadata"
+          ],
+          [
+            "rules_python+",
+            "pypi__installer",
+            "rules_python++internal_deps+pypi__installer"
+          ],
+          [
+            "rules_python+",
+            "pypi__more_itertools",
+            "rules_python++internal_deps+pypi__more_itertools"
+          ],
+          [
+            "rules_python+",
+            "pypi__packaging",
+            "rules_python++internal_deps+pypi__packaging"
+          ],
+          [
+            "rules_python+",
+            "pypi__pep517",
+            "rules_python++internal_deps+pypi__pep517"
+          ],
+          [
+            "rules_python+",
+            "pypi__pip",
+            "rules_python++internal_deps+pypi__pip"
+          ],
+          [
+            "rules_python+",
+            "pypi__pip_tools",
+            "rules_python++internal_deps+pypi__pip_tools"
+          ],
+          [
+            "rules_python+",
+            "pypi__pyproject_hooks",
+            "rules_python++internal_deps+pypi__pyproject_hooks"
+          ],
+          [
+            "rules_python+",
+            "pypi__setuptools",
+            "rules_python++internal_deps+pypi__setuptools"
+          ],
+          [
+            "rules_python+",
+            "pypi__tomli",
+            "rules_python++internal_deps+pypi__tomli"
+          ],
+          [
+            "rules_python+",
+            "pypi__wheel",
+            "rules_python++internal_deps+pypi__wheel"
+          ],
+          [
+            "rules_python+",
+            "pypi__zipp",
+            "rules_python++internal_deps+pypi__zipp"
+          ],
+          [
+            "rules_python+",
+            "pythons_hub",
+            "rules_python++python+pythons_hub"
+          ],
+          [
+            "rules_python++python+pythons_hub",
+            "python_3_10_host",
+            "rules_python++python+python_3_10_host"
+          ],
+          [
+            "rules_python++python+pythons_hub",
+            "python_3_11_host",
+            "rules_python++python+python_3_11_host"
+          ],
+          [
+            "rules_python++python+pythons_hub",
+            "python_3_12_host",
+            "rules_python++python+python_3_12_host"
+          ],
+          [
+            "rules_python++python+pythons_hub",
+            "python_3_8_host",
+            "rules_python++python+python_3_8_host"
+          ],
+          [
+            "rules_python++python+pythons_hub",
+            "python_3_9_host",
+            "rules_python++python+python_3_9_host"
+          ]
+        ]
+      }
+    }
+  }
+}
diff --git a/README.md b/README.md
index 8cded0b0..e371b279 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,8 @@
-# Prometheus Client Library for Modern C++ [![Build Status](https://travis-ci.org/jupp0r/prometheus-cpp.svg?branch=master)](https://travis-ci.org/jupp0r/prometheus-cpp)[![Coverity Scan](https://scan.coverity.com/projects/10567/badge.svg)](https://scan.coverity.com/projects/jupp0r-prometheus-cpp)
+# Prometheus Client Library for Modern C++
+
+[![Bazel CI](https://github.com/jupp0r/prometheus-cpp/workflows/Bazel%20CI/badge.svg)](https://github.com/jupp0r/prometheus-cpp/actions?workflow=Continuous+Integration)
+[![CMake CI](https://github.com/jupp0r/prometheus-cpp/workflows/CMake%20CI/badge.svg)](https://github.com/jupp0r/prometheus-cpp/actions?workflow=Continuous+Integration)
+[![Coverage Status](https://coveralls.io/repos/github/jupp0r/prometheus-cpp/badge.svg?branch=master)](https://coveralls.io/github/jupp0r/prometheus-cpp?branch=master)
 
 This library aims to enable
 [Metrics-Driven Development](https://sookocheff.com/post/mdd/mdd/) for
@@ -10,53 +14,84 @@ other push/pull collections can be added as plugins.
 
 ## Usage
 
+See https://jupp0r.github.io/prometheus-cpp for more detailed interface documentation.
+
 ``` c++
+#include <prometheus/counter.h>
+#include <prometheus/exposer.h>
+#include <prometheus/registry.h>
+
+#include <array>
 #include <chrono>
-#include <map>
+#include <cstdlib>
 #include <memory>
 #include <string>
 #include <thread>
 
-#include <prometheus/exposer.h>
-#include <prometheus/registry.h>
-
-int main(int argc, char** argv) {
+int main() {
   using namespace prometheus;
 
   // create an http server running on port 8080
   Exposer exposer{"127.0.0.1:8080"};
 
-  // create a metrics registry with component=main labels applied to all its
-  // metrics
+  // create a metrics registry
+  // @note it's the users responsibility to keep the object alive
   auto registry = std::make_shared<Registry>();
 
   // add a new counter family to the registry (families combine values with the
   // same name, but distinct label dimensions)
-  auto& counter_family = BuildCounter()
-                             .Name("time_running_seconds_total")
-                             .Help("How many seconds is this server running?")
-                             .Labels({{"label", "value"}})
+  //
+  // @note please follow the metric-naming best-practices:
+  // https://prometheus.io/docs/practices/naming/
+  auto& packet_counter = BuildCounter()
+                             .Name("observed_packets_total")
+                             .Help("Number of observed packets")
                              .Register(*registry);
 
-  // add a counter to the metric family
-  auto& second_counter = counter_family.Add(
-      {{"another_label", "value"}, {"yet_another_label", "value"}});
-
-  // ask the exposer to scrape the registry on incoming scrapes
+  // add and remember dimensional data, incrementing those is very cheap
+  auto& tcp_rx_counter =
+      packet_counter.Add({{"protocol", "tcp"}, {"direction", "rx"}});
+  auto& tcp_tx_counter =
+      packet_counter.Add({{"protocol", "tcp"}, {"direction", "tx"}});
+  auto& udp_rx_counter =
+      packet_counter.Add({{"protocol", "udp"}, {"direction", "rx"}});
+  auto& udp_tx_counter =
+      packet_counter.Add({{"protocol", "udp"}, {"direction", "tx"}});
+
+  // add a counter whose dimensional data is not known at compile time
+  // nevertheless dimensional values should only occur in low cardinality:
+  // https://prometheus.io/docs/practices/naming/#labels
+  auto& http_requests_counter = BuildCounter()
+                                    .Name("http_requests_total")
+                                    .Help("Number of HTTP requests")
+                                    .Register(*registry);
+
+  // ask the exposer to scrape the registry on incoming HTTP requests
   exposer.RegisterCollectable(registry);
 
   for (;;) {
     std::this_thread::sleep_for(std::chrono::seconds(1));
-    // increment the counter by one (second)
-    second_counter.Increment();
+    const auto random_value = std::rand();
+
+    if (random_value & 1) tcp_rx_counter.Increment();
+    if (random_value & 2) tcp_tx_counter.Increment();
+    if (random_value & 4) udp_rx_counter.Increment();
+    if (random_value & 8) udp_tx_counter.Increment();
+
+    const std::array<std::string, 4> methods = {"GET", "PUT", "POST", "HEAD"};
+    auto method = methods.at(random_value % methods.size());
+    // dynamically calling Family<T>.Add() works but is slow and should be
+    // avoided
+    http_requests_counter.Add({{"method", method}}).Increment();
   }
   return 0;
 }
+
 ```
 
 ## Requirements
 
-Using `prometheus-cpp` requires a C++11 compliant compiler. It has been successfully tested with GNU GCC 4.8 on Ubuntu Trusty and Visual Studio 2017 (but Visual Studio 2015 should work, too).
+Using `prometheus-cpp` requires a C++11 compliant compiler. It has been successfully tested with GNU GCC 7.4 on Ubuntu Bionic (18.04) and Visual Studio 2017.
 
 ## Building
 
@@ -66,11 +101,15 @@ and [bazel](https://bazel.io). Both are tested in CI and should work
 on master and for all releases.
 
 In case these instructions don't work for you, looking at
-the [travis build script](.travis.yml) might help.
+the [GitHub Workflows](.github/workflows) might help.
 
-### via CMake
+### With CMake
 
-For CMake builds don't forget to fetch the submodules first. Then build as usual.
+For CMake builds don't forget to fetch the submodules first. Please note that
+[zlib](https://zlib.net/) and [libcurl](https://curl.se/) are not provided by
+the included submodules. In the example below their usage is disabled.
+
+Then build as usual.
 
 ``` shell
 # fetch third-party dependencies
@@ -81,59 +120,105 @@ mkdir _build
 cd _build
 
 # run cmake
-cmake ..
+cmake .. -DBUILD_SHARED_LIBS=ON -DENABLE_PUSH=OFF -DENABLE_COMPRESSION=OFF
 
 # build
-make -j 4
+cmake --build . --parallel 4
 
 # run tests
 ctest -V
 
 # install the libraries and headers
-mkdir -p deploy
-make DESTDIR=`pwd`/deploy install
+cmake --install .
 ```
 
-### via Bazel
+### With Bazel
 
-Install [bazel](https://www.bazel.io).  Bazel makes it easy to add
-this repo to your project as a dependency. Just add the following
-to your `WORKSPACE`:
+Install a recent [bazel](https://www.bazel.io) version with Modules support.
+To build and test prometheus-cpp run:
 
-```python
-http_archive(
-    name = "com_github_jupp0r_prometheus_cpp",
-    strip_prefix = "prometheus-cpp-master",
-    urls = ["https://github.com/jupp0r/prometheus-cpp/archive/master.zip"],
-)
+```shell
+bazel test //...
+```
+
+## Packaging
+
+By configuring CPack you can generate an installer like a
+Debian package (.deb) or RPM (.rpm) for the static or dynamic
+libraries so they can be easily installed on
+other systems.
+
+Please refer to the [CPack](https://cmake.org/cmake/help/latest/module/CPack.html)
+documentation for all available generators and their
+configuration options.
+
+To generate a Debian package you could follow these steps:
+
+``` shell
+# fetch third-party dependencies
+git submodule update --init
 
-load("@com_github_jupp0r_prometheus_cpp//:repositories.bzl", "prometheus_cpp_repositories")
+# run cmake
+cmake -B_build -DCPACK_GENERATOR=DEB -DBUILD_SHARED_LIBS=ON # or OFF for static libraries
 
-prometheus_cpp_repositories()
+# build and package
+cmake --build _build --target package --parallel $(nproc)
 ```
 
-Then, you can reference this library in your own `BUILD` file, as
-demonstrated with the sample server included in this repository:
+This will place an appropriately named .deb in the
+`_build` folder. To build a RPM package set the `CPACK_GENERATOR`
+variable to `RPM`. 
+
+## Consuming the installed project
+
+### CMake
+
+Consuming prometheus-cpp via CMake is the preferred way because all the dependencies
+between the three prometheus-cpp libraries are handled correctly.
+
+The `cmake/project-import` directory contains an
+example project and minimal [CMakeLists.txt](cmake/project-import-cmake/CMakeLists.txt).
+
+### Ubuntu PPA
+
+The Launchpad [prometheus-cpp team](https://launchpad.net/~prometheus-cpp) provides a
+[PPA for stable versions](https://code.launchpad.net/~prometheus-cpp/+archive/ubuntu/prometheus-cpp-stable).
+Please follow the "Adding this PPA to your system" steps to use it.
+
+### vcpkg
+
+The [vcpkg](https://github.com/microsoft/vcpkg) package manager contains a
+prometheus-cpp port which has been tested on Linux, macOS, and Windows.
+
+### Conan
+
+[Conan](https://conan.io/) package manager contains prometheus-cpp package as well
+in [ConanCenter](https://conan.io/center/prometheus-cpp) repository
+
+### Bazel
+
+The Bazel Central Registry (BCR
+[provides the prometheus-cpp package](https://registry.bazel.build/modules/prometheus-cpp).
+Add the following to your `MODULE.bazel` file:
 
 ```python
-cc_binary(
-    name = "sample_server",
-    srcs = ["sample_server.cc"],
-    deps = ["@com_github_jupp0r_prometheus_cpp//:prometheus_cpp"],
-)
+bazel_dep(name = "prometheus-cpp", version = "1.2.4")
 ```
 
-When you call `prometheus_cpp_repositories()` in your `WORKSPACE` file,
-you introduce the following dependencies, if they do not exist yet, to your project:
+### Plain Makefiles
+
+When manually linking prometheus-cpp the library order matters. The needed
+libraries depend on the individual use case but the following should work for the pull metrics approach:
 
-* `load_civetweb()` to load `civetweb` rules for Civetweb
-* `load_com_google_googletest()` to load `com_google_googletest` rules for Google gtest
-* `load_com_google_googlebenchmark()` to load `com_github_google_benchmark` rules for Googlebenchmark
-* `load_com_github_curl()` to load `com_github_curl` rules for curl
-* `load_net_zlib_zlib()` to load `net_zlib_zlib` rules for zlib
+```
+-lprometheus-cpp-pull -lprometheus-cpp-core -lz
+```
 
-The list of dependencies is also available from file `repositories.bzl`.
+For the push-workflow please try:
 
+```
+-lprometheus-cpp-push -lprometheus-cpp-core -lcurl -lz
+```
 
 ## Contributing
 
@@ -145,8 +230,7 @@ guidelines](https://chris.beams.io/posts/git-commit/).
 
 You can check out this repo and build the library using
 ``` bash
-bazel build //...           # build everything
-bazel build //core //pull   # build just the libraries
+bazel build //...
 ```
 
 Run the unit tests using
@@ -166,49 +250,102 @@ bazel test //pull/tests/integration:scrape-test
 There's a benchmark suite you can run:
 
 ```
-bazel run -c opt //core/tests/benchmark
+bazel run -c opt //core/benchmarks
 
+INFO: Analysed target //core/benchmarks:benchmarks (0 packages loaded, 0 targets configured).
 INFO: Found 1 target...
-Target //core/tests/benchmark:benchmark up-to-date:
-  bazel-bin/core/tests/benchmark/benchmark
-INFO: Elapsed time: 1.682s, Critical Path: 1.56s
-
-INFO: Running command line: bazel-bin/core/tests/benchmark/benchmark
-Run on (8 X 2300 MHz CPU s)
-2016-10-17 15:56:49
-Benchmark                              Time           CPU Iterations
---------------------------------------------------------------------
-BM_Counter_Increment                  11 ns         11 ns   62947942
-BM_Counter_Collect                    84 ns         84 ns    8221752
-BM_Gauge_Increment                    11 ns         11 ns   61384663
-BM_Gauge_Decrement                    11 ns         11 ns   62148197
-BM_Gauge_SetToCurrentTime            199 ns        198 ns    3589670
-BM_Gauge_Collect                      86 ns         85 ns    7469136
-BM_Histogram_Observe/0               122 ns        122 ns    5839855
-BM_Histogram_Observe/1               116 ns        115 ns    5806623
-BM_Histogram_Observe/8               126 ns        126 ns    5781588
-BM_Histogram_Observe/64              138 ns        138 ns    4895550
-BM_Histogram_Observe/512             228 ns        228 ns    2992898
-BM_Histogram_Observe/4k              959 ns        958 ns     642231
-BM_Histogram_Collect/0               328 ns        327 ns    2002792
-BM_Histogram_Collect/1               356 ns        354 ns    1819032
-BM_Histogram_Collect/8              1553 ns       1544 ns     454921
-BM_Histogram_Collect/64            10389 ns      10287 ns      66759
-BM_Histogram_Collect/512           75795 ns      75093 ns       9075
-BM_Histogram_Collect/4k           615853 ns     610277 ns       1222
-BM_Registry_CreateFamily             195 ns        182 ns    3843894
-BM_Registry_CreateCounter/0          319 ns        317 ns    1914132
-BM_Registry_CreateCounter/1         2146 ns       2131 ns     408432
-BM_Registry_CreateCounter/8         8936 ns       8837 ns      82439
-BM_Registry_CreateCounter/64       72589 ns      72010 ns       9248
-BM_Registry_CreateCounter/512     694323 ns     686655 ns       1056
-BM_Registry_CreateCounter/4k    18246638 ns   18150525 ns         40
+Target //core/benchmarks:benchmarks up-to-date:
+  bazel-bin/core/benchmarks/benchmarks
+INFO: Elapsed time: 0.356s, Critical Path: 0.01s, Remote (0.00% of the time): [queue: 0.00%, setup: 0.00%, process: 0.00%]
+INFO: 0 processes.
+INFO: Build completed successfully, 1 total action
+INFO: Build completed successfully, 1 total action
+2018-11-30 15:13:14
+Run on (4 X 2200 MHz CPU s)
+CPU Caches:
+  L1 Data 32K (x2)
+  L1 Instruction 32K (x2)
+  L2 Unified 262K (x2)
+  L3 Unified 4194K (x1)
+-----------------------------------------------------------------------------------
+Benchmark                                            Time           CPU Iterations
+-----------------------------------------------------------------------------------
+BM_Counter_Increment                                13 ns         12 ns   55616469
+BM_Counter_Collect                                   7 ns          7 ns   99823170
+BM_Gauge_Increment                                  12 ns         12 ns   51511873
+BM_Gauge_Decrement                                  12 ns         12 ns   56831098
+BM_Gauge_SetToCurrentTime                          184 ns        183 ns    3928964
+BM_Gauge_Collect                                     6 ns          6 ns  117223478
+BM_Histogram_Observe/0                             134 ns        124 ns    5665310
+BM_Histogram_Observe/1                             122 ns        120 ns    5937185
+BM_Histogram_Observe/8                             137 ns        135 ns    4652863
+BM_Histogram_Observe/64                            143 ns        143 ns    4835957
+BM_Histogram_Observe/512                           259 ns        257 ns    2334750
+BM_Histogram_Observe/4096                         1545 ns       1393 ns     620754
+BM_Histogram_Collect/0                             103 ns        102 ns    5654829
+BM_Histogram_Collect/1                             100 ns        100 ns    7015153
+BM_Histogram_Collect/8                             608 ns        601 ns    1149652
+BM_Histogram_Collect/64                           1438 ns       1427 ns     515236
+BM_Histogram_Collect/512                          5178 ns       5159 ns     114619
+BM_Histogram_Collect/4096                        33527 ns      33280 ns      20785
+BM_Registry_CreateFamily                           320 ns        316 ns    2021567
+BM_Registry_CreateCounter/0                        128 ns        128 ns    5487140
+BM_Registry_CreateCounter/1                       2066 ns       2058 ns     386002
+BM_Registry_CreateCounter/8                       7672 ns       7634 ns      91328
+BM_Registry_CreateCounter/64                     63270 ns      62761 ns      10780
+BM_Registry_CreateCounter/512                   560714 ns     558328 ns       1176
+BM_Registry_CreateCounter/4096                18672798 ns   18383000 ns         35
+BM_Summary_Observe/0/iterations:262144            9351 ns       9305 ns     262144
+BM_Summary_Observe/1/iterations:262144            9242 ns       9169 ns     262144
+BM_Summary_Observe/8/iterations:262144           14344 ns      14195 ns     262144
+BM_Summary_Observe/64/iterations:262144          19176 ns      18950 ns     262144
+BM_Summary_Collect/0/0                              31 ns         30 ns   24873766
+BM_Summary_Collect/1/0                             166 ns        166 ns    4266706
+BM_Summary_Collect/8/0                            1040 ns       1036 ns     660527
+BM_Summary_Collect/64/0                           4529 ns       4489 ns     155600
+BM_Summary_Collect/0/1                              28 ns         28 ns   24866697
+BM_Summary_Collect/1/1                             190 ns        188 ns    3930354
+BM_Summary_Collect/8/1                            1372 ns       1355 ns     535779
+BM_Summary_Collect/64/1                           9901 ns       9822 ns      64632
+BM_Summary_Collect/0/8                              29 ns         29 ns   24922651
+BM_Summary_Collect/1/8                             217 ns        215 ns    3278381
+BM_Summary_Collect/8/8                            2275 ns       2256 ns     282503
+BM_Summary_Collect/64/8                          56790 ns      55804 ns      13878
+BM_Summary_Collect/0/64                             32 ns         31 ns   22548350
+BM_Summary_Collect/1/64                            395 ns        389 ns    1817073
+BM_Summary_Collect/8/64                          10187 ns      10064 ns      71928
+BM_Summary_Collect/64/64                        374835 ns     373560 ns       1812
+BM_Summary_Collect/0/512                            28 ns         28 ns   25234228
+BM_Summary_Collect/1/512                          1710 ns       1639 ns     802285
+BM_Summary_Collect/8/512                         50355 ns      49335 ns      15975
+BM_Summary_Collect/64/512                      2520972 ns    2493417 ns        295
+BM_Summary_Collect/0/4096                           31 ns         31 ns   24059034
+BM_Summary_Collect/1/4096                         2719 ns       2698 ns     286186
+BM_Summary_Collect/8/4096                       121689 ns     119995 ns       5647
+BM_Summary_Collect/64/4096                     5660131 ns    5587634 ns        134
+BM_Summary_Collect/0/32768                          29 ns         29 ns   22217567
+BM_Summary_Collect/1/32768                        4344 ns       4294 ns     138135
+BM_Summary_Collect/8/32768                      331563 ns     326403 ns       2017
+BM_Summary_Collect/64/32768                   16363553 ns   16038182 ns         44
+BM_Summary_Collect/0/262144                         27 ns         27 ns   23923036
+BM_Summary_Collect/1/262144                      10457 ns      10332 ns      67690
+BM_Summary_Collect/8/262144                     930434 ns     869234 ns        792
+BM_Summary_Collect/64/262144                  39217069 ns   39054846 ns         13
+BM_Summary_Observe_Common/iterations:262144       5587 ns       5557 ns     262144
+BM_Summary_Collect_Common/0                        676 ns        673 ns    1054630
+BM_Summary_Collect_Common/1                        709 ns        705 ns     990659
+BM_Summary_Collect_Common/8                       1030 ns       1025 ns     685649
+BM_Summary_Collect_Common/64                      2066 ns       2055 ns     339969
+BM_Summary_Collect_Common/512                     5754 ns       5248 ns     156895
+BM_Summary_Collect_Common/4096                   23894 ns      23292 ns      31096
+BM_Summary_Collect_Common/32768                  49831 ns      49292 ns      13492
+BM_Summary_Collect_Common/262144                128723 ns     126987 ns       5579
 ```
 
 ## Project Status
-Beta, getting ready for 1.0. The library is pretty stable and used in
-production. There are some small breaking API changes that might
-happen before 1.0 Parts of the library are instrumented by itself
+Stable and used in production.
+
+Parts of the library are instrumented by itself
 (bytes scraped, number of scrapes, scrape request latencies).  There
 is a working [example](pull/tests/integration/sample_server.cc) that's
 scraped by telegraf as part of integration tests.
diff --git a/WORKSPACE b/WORKSPACE
deleted file mode 100644
index ee0a24fa..00000000
--- a/WORKSPACE
+++ /dev/null
@@ -1,5 +0,0 @@
-workspace(name = "com_github_jupp0r_prometheus_cpp")
-
-load(":repositories.bzl", "prometheus_cpp_repositories")
-
-prometheus_cpp_repositories()
diff --git a/WORKSPACE.bzlmod b/WORKSPACE.bzlmod
new file mode 100644
index 00000000..fafa28da
--- /dev/null
+++ b/WORKSPACE.bzlmod
@@ -0,0 +1,2 @@
+# When Bzlmod is enabled, this file replaces the content of the original WORKSPACE
+# and makes sure no WORKSPACE prefix or suffix are added when Bzlmod is enabled.
diff --git a/bazel/BUILD.bazel b/bazel/BUILD.bazel
index a9f760ac..cc08aa4f 100644
--- a/bazel/BUILD.bazel
+++ b/bazel/BUILD.bazel
@@ -1,4 +1,6 @@
 exports_files(
-    glob(["*.BUILD"]),
+    glob([
+        "*.tpl",
+    ]),
     visibility = ["//visibility:public"],
 )
diff --git a/bazel/civetweb.BUILD b/bazel/civetweb.BUILD
deleted file mode 100644
index e8d60241..00000000
--- a/bazel/civetweb.BUILD
+++ /dev/null
@@ -1,94 +0,0 @@
-licenses(["notice"])  # MIT license
-
-config_setting(
-    name = "darwin",
-    values = {"cpu": "darwin"},)
-
-config_setting(
-    name = "darwin_x86_64",
-    values = {"cpu": "darwin_x86_64"},
-)
-
-config_setting(
-    name = "windows",
-    values = { "cpu": "x64_windows" },
-)
-
-config_setting(
-    name = "windows_msvc",
-    values = {"cpu": "x64_windows_msvc"},
-)
-
-cc_library(
-    name = "libcivetweb",
-    srcs = [
-        "src/civetweb.c",
-    ],
-    hdrs = [
-        "include/civetweb.h",
-    ],
-    copts = [
-        "-DUSE_IPV6",
-        "-DNDEBUG",
-        "-DNO_CGI",
-        "-DNO_CACHING",
-        "-DNO_SSL",
-        "-DNO_FILES",
-        "-UDEBUG",
-    ],
-    includes = [
-        "include",
-    ],
-    linkopts = select({
-        ":windows": [],
-        ":windows_msvc": [],
-        "//conditions:default": ["-lpthread"],
-    }) + select({
-        ":darwin": [],
-        ":darwin_x86_64": [],
-        ":windows": [],
-        ":windows_msvc": [],
-        "//conditions:default": ["-lrt"],
-    }),
-    textual_hdrs = [
-        "src/md5.inl",
-        "src/handle_form.inl",
-    ],
-    visibility = ["//visibility:public"],
-)
-
-cc_library(
-    name = "civetweb",
-    srcs = [
-        "src/CivetServer.cpp",
-    ],
-    hdrs = [
-        "include/CivetServer.h",
-    ],
-    deps = [
-        ":libcivetweb",
-    ],
-    copts = [
-        "-DUSE_IPV6",
-        "-DNDEBUG",
-        "-DNO_CGI",
-        "-DNO_CACHING",
-        "-DNO_SSL",
-        "-DNO_FILES",
-    ],
-    includes = [
-        "include",
-    ],
-    linkopts = select({
-        ":windows": [],
-        ":windows_msvc": [],
-        "//conditions:default": ["-lpthread"],
-    }) + select({
-        ":darwin": [],
-        ":darwin_x86_64": [],
-        ":windows": [],
-        ":windows_msvc": [],
-        "//conditions:default": ["-lrt"],
-    }),
-    visibility = ["//visibility:public"],
-)
\ No newline at end of file
diff --git a/bazel/curl.BUILD b/bazel/curl.BUILD
deleted file mode 100644
index 38301b50..00000000
--- a/bazel/curl.BUILD
+++ /dev/null
@@ -1,61 +0,0 @@
-# Copyright 2017, OpenCensus Authors
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# copied from: https://github.com/census-instrumentation/opencensus-cpp/blob/master/WORKSPACE
-
-licenses(["notice"])  # MIT/X derivative license
-
-load("@com_github_jupp0r_prometheus_cpp//bazel:curl.bzl", "CURL_COPTS")
-
-package(features = ['no_copts_tokenization'])
-
-config_setting(
-    name = "windows",
-    values = {"cpu": "x64_windows"},
-    visibility = [ "//visibility:private" ],
-)
-
-config_setting(
-    name = "osx",
-    values = {"cpu": "darwin"},
-    visibility = [ "//visibility:private" ],
-)
-
-cc_library(
-    name = "curl",
-    srcs = glob([
-        "lib/**/*.c",
-    ]),
-    hdrs = glob([
-        "include/curl/*.h",
-        "lib/**/*.h",
-    ]),
-    defines = ["CURL_STATICLIB"],
-    includes = ["include/", "lib/"],
-    linkopts =  select({
-        "//:windows": [
-            "-DEFAULTLIB:ws2_32.lib",
-            "-DEFAULTLIB:advapi32.lib",
-            "-DEFAULTLIB:crypt32.lib",
-            "-DEFAULTLIB:Normaliz.lib",
-        ],
-        "//conditions:default": [
-            "-lpthread",
-        ],
-    }),
-    copts = CURL_COPTS + [
-        '-DOS="os"',
-    ],
-    visibility = ["//visibility:public"],
-)
diff --git a/bazel/curl.bzl b/bazel/curl.bzl
deleted file mode 100644
index f1cbf10f..00000000
--- a/bazel/curl.bzl
+++ /dev/null
@@ -1,203 +0,0 @@
-# Copyright 2018, OpenCensus Authors
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# Compiler options for building libcurl.
-# copied from: https://github.com/census-instrumentation/opencensus-cpp/blob/master/opencensus/curl.bzl
-
-BASE_CURL_COPTS = [
-    # Disable everything else except HTTP protocol.
-    "-DHTTP_ONLY=1",
-    "-DENABLE_IPV6=1",
-    "-DGETHOSTNAME_TYPE_ARG2=size_t",
-    "-DGETSERVBYPORT_R_ARGS=6",
-    "-DGETSERVBYPORT_R_BUFSIZE=4096",
-    "-DHAVE_ALARM=1",
-    "-DHAVE_ALLOCA_H=1",
-    "-DHAVE_ARPA_INET_H=1",
-    "-DHAVE_ARPA_TFTP_H=1",
-    "-DHAVE_ASSERT_H=1",
-    "-DHAVE_BASENAME=1",
-    "-DHAVE_BOOL_T=1",
-    "-DHAVE_CLOCK_GETTIME_MONOTONIC=1",
-    "-DHAVE_CONNECT=1",
-    "-DHAVE_DLFCN_H=1",
-    "-DHAVE_ENGINE_LOAD_BUILTIN_ENGINES=1",
-    "-DHAVE_ERRNO_H=1",
-    "-DHAVE_FCNTL=1",
-    "-DHAVE_FCNTL_H=1",
-    "-DHAVE_FCNTL_O_NONBLOCK=1",
-    "-DHAVE_FDOPEN=1",
-    "-DHAVE_FREEADDRINFO=1",
-    "-DHAVE_FREEIFADDRS=1",
-    "-DHAVE_FSETXATTR=1",
-    "-DHAVE_FSETXATTR_5=1",
-    "-DHAVE_FTRUNCATE=1",
-    "-DHAVE_GAI_STRERROR=1",
-    "-DHAVE_GETADDRINFO=1",
-    "-DHAVE_GETADDRINFO_THREADSAFE=1",
-    "-DHAVE_GETEUID=1",
-    "-DHAVE_GETHOSTBYADDR=1",
-    "-DHAVE_GETHOSTBYADDR_R=1",
-    "-DHAVE_GETHOSTBYADDR_R_8=1",
-    "-DHAVE_GETHOSTBYNAME=1",
-    "-DHAVE_GETHOSTBYNAME_R=1",
-    "-DHAVE_GETHOSTBYNAME_R_6=1",
-    "-DHAVE_GETHOSTNAME=1",
-    "-DHAVE_GETIFADDRS=1",
-    "-DHAVE_GETNAMEINFO=1",
-    "-DHAVE_GETPPID=1",
-    "-DHAVE_GETPWUID=1",
-    "-DHAVE_GETPWUID_R=1",
-    "-DHAVE_GETRLIMIT=1",
-    "-DHAVE_GETSERVBYPORT_R=1",
-    "-DHAVE_GETTIMEOFDAY=1",
-    "-DHAVE_GMTIME_R=1",
-    "-DHAVE_IFADDRS_H=1",
-    "-DHAVE_IF_NAMETOINDEX=1",
-    "-DHAVE_INET_NTOP=1",
-    "-DHAVE_INET_PTON=1",
-    "-DHAVE_INTTYPES_H=1",
-    "-DHAVE_IOCTL=1",
-    "-DHAVE_IOCTL_FIONBIO=1",
-    "-DHAVE_IOCTL_SIOCGIFADDR=1",
-    "-DHAVE_LIBGEN_H=1",
-    "-DHAVE_LL=1",
-    "-DHAVE_LOCALE_H=1",
-    "-DHAVE_LOCALTIME_R=1",
-    "-DHAVE_LONGLONG=1",
-    "-DHAVE_MALLOC_H=1",
-    "-DHAVE_MEMORY_H=1",
-    "-DHAVE_NETDB_H=1",
-    "-DHAVE_NETINET_IN_H=1",
-    "-DHAVE_NETINET_TCP_H=1",
-    "-DHAVE_NET_IF_H=1",
-    "-DHAVE_PIPE=1",
-    "-DHAVE_POLL=1",
-    "-DHAVE_POLL_FINE=1",
-    "-DHAVE_POLL_H=1",
-    "-DHAVE_POSIX_STRERROR_R=1",
-    "-DHAVE_PTHREAD_H=1",
-    "-DHAVE_PWD_H=1",
-    "-DHAVE_RECV=1",
-    "-DHAVE_SELECT=1",
-    "-DHAVE_SEND=1",
-    "-DHAVE_SETJMP_H=1",
-    "-DHAVE_SETLOCALE=1",
-    "-DHAVE_SETRLIMIT=1",
-    "-DHAVE_SETSOCKOPT=1",
-    "-DHAVE_SGTTY_H=1",
-    "-DHAVE_SIGACTION=1",
-    "-DHAVE_SIGINTERRUPT=1",
-    "-DHAVE_SIGNAL=1",
-    "-DHAVE_SIGNAL_H=1",
-    "-DHAVE_SIGSETJMP=1",
-    "-DHAVE_SIG_ATOMIC_T=1",
-    "-DHAVE_SOCKADDR_IN6_SIN6_SCOPE_ID=1",
-    "-DHAVE_SOCKET=1",
-    "-DHAVE_SOCKETPAIR=1",
-    "-DHAVE_STDBOOL_H=1",
-    "-DHAVE_STDINT_H=1",
-    "-DHAVE_STDIO_H=1",
-    "-DHAVE_STDLIB_H=1",
-    "-DHAVE_STRCASECMP=1",
-    "-DHAVE_STRDUP=1",
-    "-DHAVE_STRERROR_R=1",
-    "-DHAVE_STRINGS_H=1",
-    "-DHAVE_STRING_H=1",
-    "-DHAVE_STRNCASECMP=1",
-    "-DHAVE_STRSTR=1",
-    "-DHAVE_STRTOK_R=1",
-    "-DHAVE_STRTOLL=1",
-    "-DHAVE_STRUCT_SOCKADDR_STORAGE=1",
-    "-DHAVE_STRUCT_TIMEVAL=1",
-    "-DHAVE_SYS_IOCTL_H=1",
-    "-DHAVE_SYS_PARAM_H=1",
-    "-DHAVE_SYS_POLL_H=1",
-    "-DHAVE_SYS_RESOURCE_H=1",
-    "-DHAVE_SYS_SELECT_H=1",
-    "-DHAVE_SYS_SOCKET_H=1",
-    "-DHAVE_SYS_STAT_H=1",
-    "-DHAVE_SYS_TIME_H=1",
-    "-DHAVE_SYS_TYPES_H=1",
-    "-DHAVE_SYS_UIO_H=1",
-    "-DHAVE_SYS_UN_H=1",
-    "-DHAVE_SYS_WAIT_H=1",
-    "-DHAVE_SYS_XATTR_H=1",
-    "-DHAVE_TERMIOS_H=1",
-    "-DHAVE_TERMIO_H=1",
-    "-DHAVE_TIME_H=1",
-    "-DHAVE_UNISTD_H=1",
-    "-DHAVE_UTIME=1",
-    "-DHAVE_UTIMES=1",
-    "-DHAVE_UTIME_H=1",
-    "-DHAVE_VARIADIC_MACROS_C99=1",
-    "-DHAVE_VARIADIC_MACROS_GCC=1",
-    "-DHAVE_WRITABLE_ARGV=1",
-    "-DHAVE_WRITEV=1",
-    "-DRECV_TYPE_ARG1=int",
-    "-DRECV_TYPE_ARG2=void*",
-    "-DRECV_TYPE_ARG3=size_t",
-    "-DRECV_TYPE_ARG4=int",
-    "-DRECV_TYPE_RETV=ssize_t",
-    "-DRETSIGTYPE=void",
-    "-DSELECT_QUAL_ARG5=",
-    "-DSELECT_TYPE_ARG1=int",
-    "-DSELECT_TYPE_ARG234=fd_set*",
-    "-DSELECT_TYPE_RETV=int",
-    "-DSEND_QUAL_ARG2=const",
-    "-DSEND_TYPE_ARG1=int",
-    "-DSEND_TYPE_ARG2=void*",
-    "-DSEND_TYPE_ARG3=size_t",
-    "-DSEND_TYPE_ARG4=int",
-    "-DSEND_TYPE_RETV=ssize_t",
-    "-DSIZEOF_CURL_OFF_T=8",
-    "-DSIZEOF_INT=4",
-    "-DSIZEOF_LONG=8",
-    "-DSIZEOF_OFF_T=8",
-    "-DSIZEOF_SHORT=2",
-    "-DSIZEOF_SIZE_T=8",
-    "-DSIZEOF_TIME_T=8",
-    "-DSTDC_HEADERS=1",
-    "-DSTRERROR_R_TYPE_ARG3=size_t",
-    "-DTIME_WITH_SYS_TIME=1",
-    "-DUSE_THREADS_POSIX=1",
-    "-DUSE_UNIX_SOCKETS=1",
-
-    # Extra defines needed by curl
-    "-DBUILDING_LIBCURL",
-    "-DCURL_HIDDEN_SYMBOLS",
-]
-
-LINUX_CURL_COPTS = [
-    "-DHAVE_LINUX_TCP_H=1",
-    "-DHAVE_MSG_NOSIGNAL=1",
-    "-DHAVE_STROPTS_H=1",
-]
-
-CURL_COPTS = select({
-    "//:windows": [
-        # Disable everything else except HTTP protocol.
-        "/DHTTP_ONLY=1",
-        "/DCURL_STATICLIB",
-        "/DWIN32",
-        "/DBUILDING_LIBCURL",
-        "/DUSE_WIN32_IDN",
-        "/DWANT_IDN_PROTOTYPES",
-        "/DUSE_IPV6",
-        "/DUSE_WINDOWS_SSPI",
-        "/DUSE_SCHANNEL",
-    ],
-    "//:osx": BASE_CURL_COPTS,
-    "//conditions:default": BASE_CURL_COPTS + LINUX_CURL_COPTS,
-})
diff --git a/bazel/dummy_export.h.tpl b/bazel/dummy_export.h.tpl
new file mode 100644
index 00000000..84c44eff
--- /dev/null
+++ b/bazel/dummy_export.h.tpl
@@ -0,0 +1,4 @@
+#pragma once
+
+#define {BASE_NAME}_EXPORT
+#define {BASE_NAME}_NO_EXPORT
diff --git a/bazel/export_header.bzl b/bazel/export_header.bzl
new file mode 100644
index 00000000..4637562a
--- /dev/null
+++ b/bazel/export_header.bzl
@@ -0,0 +1,21 @@
+def _generate_dummy_export_header_impl(ctx):
+    ctx.actions.expand_template(
+        template = ctx.file._template,
+        output = ctx.outputs.header_file,
+        substitutions = {
+            "{BASE_NAME}": ctx.attr.basename,
+        },
+    )
+
+generate_dummy_export_header = rule(
+    attrs = {
+        "basename": attr.string(mandatory = True),
+        "header": attr.string(mandatory = True),
+        "_template": attr.label(
+            allow_single_file = True,
+            default = Label("@com_github_jupp0r_prometheus_cpp//bazel:dummy_export.h.tpl"),
+        ),
+    },
+    implementation = _generate_dummy_export_header_impl,
+    outputs = {"header_file": "%{header}"},
+)
diff --git a/bazel/zlib.BUILD b/bazel/zlib.BUILD
deleted file mode 100644
index 9091e8eb..00000000
--- a/bazel/zlib.BUILD
+++ /dev/null
@@ -1,13 +0,0 @@
-# copied from: https://github.com/bazelbuild/bazel/blob/master/third_party/zlib/BUILD
-
-licenses(["notice"])  # BSD/MIT-like license (for zlib)
-
-cc_library(
-    name = "z",
-    srcs = glob(["*.c"]),
-    hdrs = glob(["*.h"]),
-    # Use -Dverbose=-1 to turn off zlib's trace logging. (bazelbuild/bazel#3280)
-    copts = ["-w", "-Dverbose=-1"],
-    includes = ["."],
-    visibility = ["//visibility:public"],
-)
\ No newline at end of file
diff --git a/cmake/CheckAtomic.cmake b/cmake/CheckAtomic.cmake
new file mode 100644
index 00000000..bbb6e474
--- /dev/null
+++ b/cmake/CheckAtomic.cmake
@@ -0,0 +1,37 @@
+# Inspired by CheckAtomic.cmake from LLVM project:
+# https://github.com/llvm/llvm-project/blob/master/llvm/cmake/modules/CheckAtomic.cmake
+#
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+include(CheckCXXSourceCompiles)
+include(CheckLibraryExists)
+
+function(check_working_cxx_atomics varname)
+  check_cxx_source_compiles("
+#include <atomic>
+#include <cstdint>
+std::atomic<std::uint64_t> x(0);
+int main() {
+  std::uint64_t i = x.load(std::memory_order_relaxed);
+  return static_cast<int>(i);
+}
+" ${varname})
+endfunction()
+
+if(CMAKE_CXX_COMPILER_ID MATCHES "Clang|GNU")
+  # First check if atomics work without the library.
+  check_working_cxx_atomics(HAVE_CXX_ATOMICS_WITHOUT_LIB)
+  # If not, check if the library exists, and atomics work with it.
+  if(NOT HAVE_CXX_ATOMICS_WITHOUT_LIB)
+    check_library_exists(atomic __atomic_load_8 "" HAVE_CXX_LIBATOMIC)
+    if(HAVE_CXX_LIBATOMIC)
+      list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
+      check_working_cxx_atomics(HAVE_CXX_ATOMICS_WITH_LIB)
+      if(NOT HAVE_CXX_ATOMICS_WITH_LIB)
+        message(FATAL_ERROR "Host compiler must support 64-bit std::atomic!")
+      endif()
+    else()
+      message(FATAL_ERROR "Host compiler appears to require libatomic for 64-bit operations, but cannot find it.")
+    endif()
+  endif()
+endif()
diff --git a/cmake/FindCivetWeb.cmake b/cmake/FindCivetWeb.cmake
deleted file mode 100644
index 0854eac3..00000000
--- a/cmake/FindCivetWeb.cmake
+++ /dev/null
@@ -1,56 +0,0 @@
-find_path(CIVETWEB_INCLUDE_DIR
-  NAMES civetweb.h
-  DOC "The CivetWeb include directory"
-)
-
-find_path(CIVETWEB_CXX_INCLUDE_DIR
-  NAMES CivetServer.h
-  DOC "The CivetWeb C++ include directory"
-)
-
-find_library(CIVETWEB_LIBRARY
-  NAMES civetweb
-  DOC "The CivetWeb library"
-)
-
-find_library(CIVETWEB_CXX_LIBRARY
-  NAMES civetweb-cpp
-  DOC "The CivetWeb C++ library"
-)
-
-mark_as_advanced(CIVETWEB_LIBRARY CIVETWEB_CXX_LIBRARY CIVETWEB_INCLUDE_DIR CIVETWEB_CXX_INCLUDE_DIR)
-
-if(CIVETWEB_INCLUDE_DIR AND EXISTS "${CIVETWEB_INCLUDE_DIR}/civetweb.h")
-  file(STRINGS "${CIVETWEB_INCLUDE_DIR}/civetweb.h" civetweb_version_str REGEX "^#define[\t ]+CIVETWEB_VERSION[\t ]+\".*\"")
-
-  string(REGEX REPLACE "^.*CIVETWEB_VERSION[\t ]+\"([^\"]*)\".*$" "\\1" CIVETWEB_VERSION_STRING "${civetweb_version_str}")
-  unset(civetweb_version_str)
-endif()
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(CivetWeb
-                                  FOUND_VAR CivetWeb_FOUND
-                                  REQUIRED_VARS CIVETWEB_LIBRARY CIVETWEB_CXX_LIBRARY CIVETWEB_INCLUDE_DIR CIVETWEB_CXX_INCLUDE_DIR
-                                  VERSION_VAR CIVETWEB_VERSION_STRING)
-
-if(CivetWeb_FOUND)
-  set(CIVETWEB_LIBRARIES CivetWeb::CivetWeb CivetWeb::CivetWebCpp)
-  set(CIVETWEB_INCLUDE_DIRS "${CIVETWEB_INCLUDE_DIR}" "${CIVETWEB_CXX_INCLUDE_DIR}")
-  if(NOT TARGET CivetWeb::CivetWeb)
-    add_library(CivetWeb::CivetWeb UNKNOWN IMPORTED)
-    set_target_properties(CivetWeb::CivetWeb PROPERTIES
-      IMPORTED_LOCATION "${CIVETWEB_LIBRARY}"
-      INTERFACE_INCLUDE_DIRECTORIES "${CIVETWEB_INCLUDE_DIR}"
-      IMPORTED_LINK_INTERFACE_LANGUAGES "C"
-    )
-  endif()
-  if(NOT TARGET CivetWeb::CivetWebCpp)
-    add_library(CivetWeb::CivetWebCpp UNKNOWN IMPORTED)
-    set_target_properties(CivetWeb::CivetWebCpp PROPERTIES
-      IMPORTED_LOCATION "${CIVETWEB_CXX_LIBRARY}"
-      INTERFACE_INCLUDE_DIRECTORIES "${CIVETWEB_CXX_INCLUDE_DIR}"
-      IMPORTED_LINK_INTERFACE_LIBRARIES "CivetWeb::CivetWeb"
-      IMPORTED_LINK_INTERFACE_LANGUAGES "CXX"
-    )
-  endif()
-endif()
diff --git a/cmake/FindGoogleBenchmark.cmake b/cmake/FindGoogleBenchmark.cmake
deleted file mode 100644
index 6b50152c..00000000
--- a/cmake/FindGoogleBenchmark.cmake
+++ /dev/null
@@ -1,25 +0,0 @@
-find_library(GoogleBenchmark_LIBRARY NAMES benchmark)
-find_path(GoogleBenchmark_INCLUDE_DIR benchmark/benchmark.h)
-mark_as_advanced(GoogleBenchmark_LIBRARY GoogleBenchmark_INCLUDE_DIR)
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(GoogleBenchmark
-  FOUND_VAR GoogleBenchmark_FOUND
-  REQUIRED_VARS
-    GoogleBenchmark_LIBRARY
-    GoogleBenchmark_INCLUDE_DIR
-)
-
-if(GoogleBenchmark_FOUND)
-  set(GoogleBenchmark_LIBRARIES ${GoogleBenchmark_LIBRARY})
-  set(GoogleBenchmark_INCLUDE_DIRS ${GoogleBenchmark_INCLUDE_DIR})
-
-  if(NOT TARGET Google::Benchmark)
-    add_library(Google::Benchmark UNKNOWN IMPORTED)
-    set_target_properties(Google::Benchmark PROPERTIES
-      INTERFACE_INCLUDE_DIRECTORIES "${GoogleBenchmark_INCLUDE_DIR}"
-      IMPORTED_LINK_INTERFACE_LANGUAGES "CXX"
-      IMPORTED_LOCATION "${GoogleBenchmark_LIBRARY}"
-    )
-  endif()
-endif()
diff --git a/cmake/civetweb-3rdparty-config.cmake b/cmake/civetweb-3rdparty-config.cmake
index 17683542..8cc73cf9 100644
--- a/cmake/civetweb-3rdparty-config.cmake
+++ b/cmake/civetweb-3rdparty-config.cmake
@@ -19,6 +19,11 @@ add_library(civetweb OBJECT
   ${_IMPORT_PREFIX}/src/md5.inl
 )
 
+set_property(TARGET civetweb PROPERTY PUBLIC_HEADER
+  ${_IMPORT_PREFIX}/include/CivetServer.h
+  ${_IMPORT_PREFIX}/include/civetweb.h
+)
+
 target_compile_definitions(civetweb
   PRIVATE
     CIVETWEB_API=
@@ -26,8 +31,14 @@ target_compile_definitions(civetweb
     NDEBUG
     NO_CGI
     NO_CACHING
-    NO_SSL
     NO_FILES
+    SOCKET_TIMEOUT_QUANTUM=200
+)
+
+target_compile_options(civetweb
+  PRIVATE
+    $<$<CXX_COMPILER_ID:AppleClang>:-w>
+    $<$<CXX_COMPILER_ID:GNU>:-w>
 )
 
 target_include_directories(civetweb
@@ -35,6 +46,18 @@ target_include_directories(civetweb
     ${CIVETWEB_INCLUDE_DIRS}
 )
 
+if(THIRDPARTY_CIVETWEB_WITH_SSL)
+  include(CMakeFindDependencyMacro)
+  find_dependency(OpenSSL)
+  if(OPENSSL_VERSION VERSION_GREATER_EQUAL 1.1)
+    target_compile_definitions(civetweb PRIVATE OPENSSL_API_1_1)
+  endif()
+  target_compile_definitions(civetweb PRIVATE NO_SSL_DL)
+  target_link_libraries(civetweb PUBLIC OpenSSL::SSL)
+else()
+  target_compile_definitions(civetweb PRIVATE NO_SSL)
+endif()
+
 if(BUILD_SHARED_LIBS)
   set_target_properties(civetweb PROPERTIES
     POSITION_INDEPENDENT_CODE ON
@@ -43,3 +66,8 @@ if(BUILD_SHARED_LIBS)
     VISIBILITY_INLINES_HIDDEN ON
   )
 endif()
+
+set_target_properties(civetweb PROPERTIES
+  C_INCLUDE_WHAT_YOU_USE ""
+  CXX_INCLUDE_WHAT_YOU_USE ""
+)
diff --git a/cmake/googlemock-3rdparty-config.cmake b/cmake/googlemock-3rdparty-config.cmake
index c7bc4428..66defd2f 100644
--- a/cmake/googlemock-3rdparty-config.cmake
+++ b/cmake/googlemock-3rdparty-config.cmake
@@ -8,7 +8,7 @@ add_library(gmock_main STATIC EXCLUDE_FROM_ALL
   ${_IMPORT_PREFIX}/googlemock/src/gmock_main.cc
 )
 
-target_include_directories(gmock_main
+target_include_directories(gmock_main SYSTEM
   PUBLIC
     ${_IMPORT_PREFIX}/googletest/include
     ${_IMPORT_PREFIX}/googlemock/include
@@ -22,3 +22,8 @@ target_link_libraries(gmock_main
     Threads::Threads
 )
 add_library(GTest::gmock_main ALIAS gmock_main)
+
+set_target_properties(gmock_main PROPERTIES
+  C_INCLUDE_WHAT_YOU_USE ""
+  CXX_INCLUDE_WHAT_YOU_USE ""
+)
diff --git a/cmake/googletest.imp b/cmake/googletest.imp
new file mode 100644
index 00000000..a60e2d7d
--- /dev/null
+++ b/cmake/googletest.imp
@@ -0,0 +1,6 @@
+[
+  { include: [ "@<gmock/.*>", private, "<gmock/gmock.h>", public ] },
+  { include: [ "@<gtest/.*>", private, "<gtest/gtest.h>", public ] },
+  { include: [ "@<bits/chrono.h>", private, "<chrono>", public ]},
+  { include: [ "@<bits/this_thread_sleep.h>", private, "<thread>", public ]}
+]
diff --git a/cmake/project-import-cmake/CMakeLists.txt b/cmake/project-import-cmake/CMakeLists.txt
new file mode 100644
index 00000000..73dbd74e
--- /dev/null
+++ b/cmake/project-import-cmake/CMakeLists.txt
@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
+
+project(prometheus-cpp-import)
+
+find_package(prometheus-cpp CONFIG REQUIRED)
+
+if(NOT DEFINED prometheus-cpp_VERSION)
+  message(FATAL_ERROR "prometheus-cpp_VERSION is not defined")
+endif()
+
+if(PROMETHEUS_CPP_ENABLE_PUSH)
+  add_executable(sample-client sample_client.cc)
+  target_link_libraries(sample-client PRIVATE prometheus-cpp::push $<$<BOOL:${WIN32}>:Ws2_32>)
+endif()
+
+if(PROMETHEUS_CPP_ENABLE_PULL)
+  add_executable(sample-server sample_server.cc)
+  target_link_libraries(sample-server PRIVATE prometheus-cpp::pull)
+endif()
diff --git a/cmake/project-import-cmake/sample_client.cc b/cmake/project-import-cmake/sample_client.cc
new file mode 120000
index 00000000..4c67af80
--- /dev/null
+++ b/cmake/project-import-cmake/sample_client.cc
@@ -0,0 +1 @@
+../../push/tests/integration/sample_client.cc
\ No newline at end of file
diff --git a/cmake/project-import-cmake/sample_server.cc b/cmake/project-import-cmake/sample_server.cc
new file mode 120000
index 00000000..89f9e5c0
--- /dev/null
+++ b/cmake/project-import-cmake/sample_server.cc
@@ -0,0 +1 @@
+../../pull/tests/integration/sample_server.cc
\ No newline at end of file
diff --git a/cmake/project-import-pkgconfig/CMakeLists.txt b/cmake/project-import-pkgconfig/CMakeLists.txt
new file mode 100644
index 00000000..5a6ef9ff
--- /dev/null
+++ b/cmake/project-import-pkgconfig/CMakeLists.txt
@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
+
+project(prometheus-cpp-import)
+
+set(CMAKE_CXX_STANDARD 11)
+
+find_package(PkgConfig REQUIRED)
+
+pkg_check_modules(PROMETHEUS_CPP_CORE REQUIRED prometheus-cpp-core)
+pkg_check_modules(PROMETHEUS_CPP_PUSH IMPORTED_TARGET prometheus-cpp-push)
+pkg_check_modules(PROMETHEUS_CPP_PULL IMPORTED_TARGET prometheus-cpp-pull)
+
+if(PROMETHEUS_CPP_PUSH_FOUND)
+  add_executable(sample-client sample_client.cc)
+  target_link_libraries(sample-client PRIVATE PkgConfig::PROMETHEUS_CPP_PUSH $<$<BOOL:${WIN32}>:Ws2_32>)
+endif()
+
+if(PROMETHEUS_CPP_PULL_FOUND)
+  add_executable(sample-server sample_server.cc)
+  target_link_libraries(sample-server PRIVATE PkgConfig::PROMETHEUS_CPP_PULL)
+endif()
diff --git a/cmake/project-import-pkgconfig/sample_client.cc b/cmake/project-import-pkgconfig/sample_client.cc
new file mode 120000
index 00000000..4c67af80
--- /dev/null
+++ b/cmake/project-import-pkgconfig/sample_client.cc
@@ -0,0 +1 @@
+../../push/tests/integration/sample_client.cc
\ No newline at end of file
diff --git a/cmake/project-import-pkgconfig/sample_server.cc b/cmake/project-import-pkgconfig/sample_server.cc
new file mode 120000
index 00000000..89f9e5c0
--- /dev/null
+++ b/cmake/project-import-pkgconfig/sample_server.cc
@@ -0,0 +1 @@
+../../pull/tests/integration/sample_server.cc
\ No newline at end of file
diff --git a/cmake/prometheus-cpp-config.cmake.in b/cmake/prometheus-cpp-config.cmake.in
index 9c64914e..fe9606e0 100644
--- a/cmake/prometheus-cpp-config.cmake.in
+++ b/cmake/prometheus-cpp-config.cmake.in
@@ -6,11 +6,23 @@ set_and_check(prometheus-cpp_INCLUDE_DIR "@PACKAGE_CMAKE_INSTALL_INCLUDEDIR@")
 set(PROMETHEUS_CPP_ENABLE_PULL @ENABLE_PULL@)
 set(PROMETHEUS_CPP_ENABLE_PUSH @ENABLE_PUSH@)
 set(PROMETHEUS_CPP_USE_COMPRESSION @ENABLE_COMPRESSION@)
+set(PROMETHEUS_CPP_USE_THIRDPARTY_LIBRARIES @USE_THIRDPARTY_LIBRARIES@)
+set(PROMETHEUS_CPP_THIRDPARTY_CIVETWEB_WITH_SSL @THIRDPARTY_CIVETWEB_WITH_SSL@)
 
 set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
 find_dependency(Threads)
 unset(CMAKE_THREAD_PREFER_PTHREAD)
 
+if(PROMETHEUS_CPP_ENABLE_PULL)
+  if(PROMETHEUS_CPP_USE_THIRDPARTY_LIBRARIES)
+    if(PROMETHEUS_CPP_THIRDPARTY_CIVETWEB_WITH_SSL)
+        find_dependency(OpenSSL)
+    endif()
+  else()
+    find_dependency(civetweb)
+  endif()
+endif()
+
 if(PROMETHEUS_CPP_ENABLE_PULL AND PROMETHEUS_CPP_USE_COMPRESSION)
   find_dependency(ZLIB)
 endif()
diff --git a/cmake/prometheus-cpp-core.pc.in b/cmake/prometheus-cpp-core.pc.in
new file mode 100644
index 00000000..7904f2a1
--- /dev/null
+++ b/cmake/prometheus-cpp-core.pc.in
@@ -0,0 +1,14 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}
+includedir=@PROMETHEUS_CPP_PKGCONFIG_INCLUDEDIR@
+libdir=@PROMETHEUS_CPP_PKGCONFIG_LIBDIR@
+
+Name: @PROJECT_NAME@-core
+Description: @PROJECT_DESCRIPTION@
+URL: @PROJECT_HOMEPAGE_URL@
+Version: @PROJECT_VERSION@
+Requires:
+Requires.private: @PKGCONFIG_REQUIRES@
+Cflags: -I${includedir}
+Libs: -L${libdir} -l@PROJECT_NAME@-core
+Libs.private: @CMAKE_THREAD_LIBS_INIT@ @PKGCONFIG_LIBS@
\ No newline at end of file
diff --git a/cmake/prometheus-cpp-pull.pc.in b/cmake/prometheus-cpp-pull.pc.in
new file mode 100644
index 00000000..d0652f67
--- /dev/null
+++ b/cmake/prometheus-cpp-pull.pc.in
@@ -0,0 +1,14 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}
+includedir=@PROMETHEUS_CPP_PKGCONFIG_INCLUDEDIR@
+libdir=@PROMETHEUS_CPP_PKGCONFIG_LIBDIR@
+
+Name: @PROJECT_NAME@-pull
+Description: @PROJECT_DESCRIPTION@
+URL: @PROJECT_HOMEPAGE_URL@
+Version: @PROJECT_VERSION@
+Requires: @PROJECT_NAME@-core
+Requires.private: @PKGCONFIG_REQUIRES@
+Cflags: -I${includedir}
+Libs: -L${libdir} -l@PROJECT_NAME@-pull
+Libs.private: @CMAKE_THREAD_LIBS_INIT@ @PKGCONFIG_LIBS@
diff --git a/cmake/prometheus-cpp-push.pc.in b/cmake/prometheus-cpp-push.pc.in
new file mode 100644
index 00000000..a362310c
--- /dev/null
+++ b/cmake/prometheus-cpp-push.pc.in
@@ -0,0 +1,14 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}
+includedir=@PROMETHEUS_CPP_PKGCONFIG_INCLUDEDIR@
+libdir=@PROMETHEUS_CPP_PKGCONFIG_LIBDIR@
+
+Name: @PROJECT_NAME@-push
+Description: @PROJECT_DESCRIPTION@
+URL: @PROJECT_HOMEPAGE_URL@
+Version: @PROJECT_VERSION@
+Requires: @PROJECT_NAME@-core @PKGCONFIG_REQUIRES@
+Requires.private:
+Cflags: -I${includedir}
+Libs: -L${libdir} -l@PROJECT_NAME@-push
+Libs.private: @CMAKE_THREAD_LIBS_INIT@ @PKGCONFIG_LIBS@
diff --git a/core/BUILD.bazel b/core/BUILD.bazel
index 263c37b8..a302f195 100644
--- a/core/BUILD.bazel
+++ b/core/BUILD.bazel
@@ -1,3 +1,11 @@
+load("//bazel:export_header.bzl", "generate_dummy_export_header")
+
+generate_dummy_export_header(
+    name = "export_header",
+    basename = "PROMETHEUS_CPP_CORE",
+    header = "include/prometheus/detail/core_export.h",
+)
+
 cc_library(
     name = "core",
     srcs = glob([
@@ -6,7 +14,7 @@ cc_library(
     ]),
     hdrs = glob(
         ["include/**/*.h"],
-    ),
+    ) + [":export_header"],
     strip_include_prefix = "include",
     visibility = ["//visibility:public"],
 )
diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index ba90d9bf..180e3f1e 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -2,14 +2,14 @@
 add_library(core
   src/check_names.cc
   src/counter.cc
+  src/detail/builder.cc
   src/detail/ckms_quantiles.cc
-  src/detail/counter_builder.cc
-  src/detail/gauge_builder.cc
-  src/detail/histogram_builder.cc
-  src/detail/summary_builder.cc
   src/detail/time_window_quantiles.cc
+  src/detail/utils.cc
+  src/family.cc
   src/gauge.cc
   src/histogram.cc
+  src/info.cc
   src/registry.cc
   src/serializer.cc
   src/summary.cc
@@ -18,18 +18,41 @@ add_library(core
 
 add_library(${PROJECT_NAME}::core ALIAS core)
 
+target_compile_features(core
+  PUBLIC
+    cxx_std_11
+)
+
 target_link_libraries(core
   PRIVATE
     Threads::Threads
-    $<$<AND:$<BOOL:UNIX>,$<NOT:$<BOOL:APPLE>>>:rt>
+    $<$<AND:$<BOOL:${UNIX}>,$<NOT:$<BOOL:${APPLE}>>>:rt>
 )
 
+if(HAVE_CXX_LIBATOMIC)
+  # the exported library config must use libatomic unconditionally
+  # (the HAVE_CXX_LIBATOMIC variable should not leak into the target config)
+  target_link_libraries(core PUBLIC atomic)
+endif()
+
 target_include_directories(core
   PUBLIC
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>
+)
+
+set_target_properties(core
+  PROPERTIES
+    OUTPUT_NAME ${PROJECT_NAME}-core
+    DEFINE_SYMBOL PROMETHEUS_CPP_CORE_EXPORTS
+    VERSION "${PROJECT_VERSION}"
+    SOVERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}"
 )
 
-set_target_properties(core PROPERTIES OUTPUT_NAME ${PROJECT_NAME}-core)
+generate_export_header(core
+  BASE_NAME ${PROJECT_NAME}-core
+  EXPORT_FILE_NAME include/prometheus/detail/core_export.h
+)
 
 install(
   TARGETS core
@@ -41,14 +64,37 @@ install(
 )
 
 install(
-  DIRECTORY include/
+  DIRECTORY include/ ${CMAKE_CURRENT_BINARY_DIR}/include/
   DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )
 
+if(GENERATE_PKGCONFIG)
+  set(PKGCONFIG_LIBS)
+  set(PKGCONFIG_REQUIRES)
+
+  if(HAVE_CXX_LIBATOMIC)
+    string(APPEND PKGCONFIG_LIBS " -latomic")
+  endif()
+
+  configure_file(
+    ${PROJECT_SOURCE_DIR}/cmake/prometheus-cpp-core.pc.in
+    ${CMAKE_CURRENT_BINARY_DIR}/prometheus-cpp-core.pc
+    @ONLY
+  )
+
+  install(
+    FILES ${CMAKE_CURRENT_BINARY_DIR}/prometheus-cpp-core.pc
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
+  )
+
+  unset(PKGCONFIG_LIBS)
+  unset(PKGCONFIG_REQUIRES)
+endif()
+
 if(ENABLE_TESTING)
   add_subdirectory(tests)
-endif()
 
-if(GoogleBenchmark_FOUND)
-  add_subdirectory(benchmarks)
+  if(benchmark_FOUND)
+    add_subdirectory(benchmarks)
+  endif()
 endif()
diff --git a/core/benchmarks/BUILD.bazel b/core/benchmarks/BUILD.bazel
index bd48104e..fefc940b 100644
--- a/core/benchmarks/BUILD.bazel
+++ b/core/benchmarks/BUILD.bazel
@@ -4,9 +4,9 @@ cc_binary(
         "*.cc",
         "*.h",
     ]),
-    linkstatic = 1,
+    linkstatic = True,
     deps = [
         "//core",
-        "@com_github_google_benchmark//:benchmark",
+        "@google_benchmark//:benchmark",
     ],
 )
diff --git a/core/benchmarks/CMakeLists.txt b/core/benchmarks/CMakeLists.txt
index ae1bdfaa..c1294d5a 100644
--- a/core/benchmarks/CMakeLists.txt
+++ b/core/benchmarks/CMakeLists.txt
@@ -6,6 +6,7 @@ add_executable(benchmarks
   counter_bench.cc
   gauge_bench.cc
   histogram_bench.cc
+  info_bench.cc
   registry_bench.cc
   summary_bench.cc
 )
@@ -13,10 +14,15 @@ add_executable(benchmarks
 target_link_libraries(benchmarks
   PRIVATE
     ${PROJECT_NAME}::core
-    Google::Benchmark
+    benchmark::benchmark
 )
 
 add_test(
   NAME benchmarks
   COMMAND benchmarks
 )
+
+set_property(
+  TEST benchmarks
+  APPEND PROPERTY LABELS Benchmark
+)
diff --git a/core/benchmarks/benchmark_helpers.cc b/core/benchmarks/benchmark_helpers.cc
index 12cb5a20..78f719c2 100644
--- a/core/benchmarks/benchmark_helpers.cc
+++ b/core/benchmarks/benchmark_helpers.cc
@@ -1,12 +1,13 @@
+#include "benchmark_helpers.h"
+
 #include <algorithm>
 #include <cstdlib>
+#include <map>
 
-#include "benchmark_helpers.h"
-
-std::string GenerateRandomString(size_t length) {
+std::string GenerateRandomString(std::size_t length) {
   auto randchar = []() -> char {
     const char charset[] = "abcdefghijklmnopqrstuvwxyz";
-    const size_t max_index = (sizeof(charset) - 1);
+    const std::size_t max_index = (sizeof(charset) - 1);
     return charset[rand() % max_index];
   };
   std::string str(length, 0);
@@ -14,10 +15,9 @@ std::string GenerateRandomString(size_t length) {
   return str;
 }
 
-std::map<std::string, std::string> GenerateRandomLabels(
-    std::size_t number_of_pairs) {
+prometheus::Labels GenerateRandomLabels(std::size_t number_of_pairs) {
   const auto label_character_count = 10;
-  auto label_pairs = std::map<std::string, std::string>{};
+  auto label_pairs = prometheus::Labels{};
   for (std::size_t i = 0; i < number_of_pairs; i++) {
     label_pairs.insert({GenerateRandomString(label_character_count),
                         GenerateRandomString(label_character_count)});
diff --git a/core/benchmarks/benchmark_helpers.h b/core/benchmarks/benchmark_helpers.h
index 0b449a67..51866764 100644
--- a/core/benchmarks/benchmark_helpers.h
+++ b/core/benchmarks/benchmark_helpers.h
@@ -1,8 +1,9 @@
 #pragma once
 
-#include <map>
+#include <cstddef>
 #include <string>
 
-std::string GenerateRandomString(size_t length);
-std::map<std::string, std::string> GenerateRandomLabels(
-    std::size_t number_of_labels);
+#include "prometheus/labels.h"
+
+std::string GenerateRandomString(std::size_t length);
+prometheus::Labels GenerateRandomLabels(std::size_t number_of_labels);
diff --git a/core/benchmarks/counter_bench.cc b/core/benchmarks/counter_bench.cc
index fc419d86..be060386 100644
--- a/core/benchmarks/counter_bench.cc
+++ b/core/benchmarks/counter_bench.cc
@@ -1,10 +1,13 @@
 #include <benchmark/benchmark.h>
-#include <prometheus/registry.h>
+
+#include "prometheus/counter.h"
+#include "prometheus/family.h"
+#include "prometheus/registry.h"
 
 static void BM_Counter_Increment(benchmark::State& state) {
-  using prometheus::Registry;
-  using prometheus::Counter;
   using prometheus::BuildCounter;
+  using prometheus::Counter;
+  using prometheus::Registry;
   Registry registry;
   auto& counter_family =
       BuildCounter().Name("benchmark_counter").Help("").Register(registry);
@@ -15,9 +18,9 @@ static void BM_Counter_Increment(benchmark::State& state) {
 BENCHMARK(BM_Counter_Increment);
 
 static void BM_Counter_Collect(benchmark::State& state) {
-  using prometheus::Registry;
-  using prometheus::Counter;
   using prometheus::BuildCounter;
+  using prometheus::Counter;
+  using prometheus::Registry;
   Registry registry;
   auto& counter_family =
       BuildCounter().Name("benchmark_counter").Help("").Register(registry);
diff --git a/core/benchmarks/gauge_bench.cc b/core/benchmarks/gauge_bench.cc
index 8fb40948..87bcec56 100644
--- a/core/benchmarks/gauge_bench.cc
+++ b/core/benchmarks/gauge_bench.cc
@@ -1,10 +1,13 @@
 #include <benchmark/benchmark.h>
-#include <prometheus/registry.h>
+
+#include "prometheus/family.h"
+#include "prometheus/gauge.h"
+#include "prometheus/registry.h"
 
 static void BM_Gauge_Increment(benchmark::State& state) {
-  using prometheus::Registry;
-  using prometheus::Gauge;
   using prometheus::BuildGauge;
+  using prometheus::Gauge;
+  using prometheus::Registry;
   Registry registry;
   auto& gauge_family =
       BuildGauge().Name("benchmark_gauge").Help("").Register(registry);
@@ -15,9 +18,9 @@ static void BM_Gauge_Increment(benchmark::State& state) {
 BENCHMARK(BM_Gauge_Increment);
 
 static void BM_Gauge_Decrement(benchmark::State& state) {
-  using prometheus::Registry;
-  using prometheus::Gauge;
   using prometheus::BuildGauge;
+  using prometheus::Gauge;
+  using prometheus::Registry;
   Registry registry;
   auto& gauge_family =
       BuildGauge().Name("benchmark_gauge").Help("").Register(registry);
@@ -28,9 +31,9 @@ static void BM_Gauge_Decrement(benchmark::State& state) {
 BENCHMARK(BM_Gauge_Decrement);
 
 static void BM_Gauge_SetToCurrentTime(benchmark::State& state) {
-  using prometheus::Registry;
-  using prometheus::Gauge;
   using prometheus::BuildGauge;
+  using prometheus::Gauge;
+  using prometheus::Registry;
   Registry registry;
   auto& gauge_family =
       BuildGauge().Name("benchmark_gauge").Help("").Register(registry);
@@ -41,9 +44,9 @@ static void BM_Gauge_SetToCurrentTime(benchmark::State& state) {
 BENCHMARK(BM_Gauge_SetToCurrentTime);
 
 static void BM_Gauge_Collect(benchmark::State& state) {
-  using prometheus::Registry;
-  using prometheus::Gauge;
   using prometheus::BuildGauge;
+  using prometheus::Gauge;
+  using prometheus::Registry;
   Registry registry;
   auto& gauge_family =
       BuildGauge().Name("benchmark_gauge").Help("").Register(registry);
diff --git a/core/benchmarks/histogram_bench.cc b/core/benchmarks/histogram_bench.cc
index f2996b1d..5d929702 100644
--- a/core/benchmarks/histogram_bench.cc
+++ b/core/benchmarks/histogram_bench.cc
@@ -1,13 +1,19 @@
+#include <benchmark/benchmark.h>
+
 #include <chrono>
+#include <cstdint>
 #include <random>
+#include <vector>
 
-#include <benchmark/benchmark.h>
-#include <prometheus/registry.h>
+#include "prometheus/family.h"
+#include "prometheus/histogram.h"
+#include "prometheus/registry.h"
 
 using prometheus::Histogram;
 
-static Histogram::BucketBoundaries CreateLinearBuckets(double start, double end,
-                                                       double step) {
+static Histogram::BucketBoundaries CreateLinearBuckets(std::int64_t start,
+                                                       std::int64_t end,
+                                                       std::int64_t step) {
   auto bucket_boundaries = Histogram::BucketBoundaries{};
   for (auto i = start; i < end; i += step) {
     bucket_boundaries.push_back(i);
@@ -16,9 +22,9 @@ static Histogram::BucketBoundaries CreateLinearBuckets(double start, double end,
 }
 
 static void BM_Histogram_Observe(benchmark::State& state) {
-  using prometheus::Registry;
-  using prometheus::Histogram;
   using prometheus::BuildHistogram;
+  using prometheus::Histogram;
+  using prometheus::Registry;
 
   const auto number_of_buckets = state.range(0);
 
@@ -42,12 +48,12 @@ static void BM_Histogram_Observe(benchmark::State& state) {
     state.SetIterationTime(elapsed_seconds.count());
   }
 }
-BENCHMARK(BM_Histogram_Observe)->Range(0, 4096);
+BENCHMARK(BM_Histogram_Observe)->Range(0, 4096)->UseManualTime();
 
 static void BM_Histogram_Collect(benchmark::State& state) {
-  using prometheus::Registry;
-  using prometheus::Histogram;
   using prometheus::BuildHistogram;
+  using prometheus::Histogram;
+  using prometheus::Registry;
 
   const auto number_of_buckets = state.range(0);
 
diff --git a/core/benchmarks/info_bench.cc b/core/benchmarks/info_bench.cc
new file mode 100644
index 00000000..f9e5e16c
--- /dev/null
+++ b/core/benchmarks/info_bench.cc
@@ -0,0 +1,20 @@
+#include <benchmark/benchmark.h>
+
+#include "prometheus/family.h"
+#include "prometheus/info.h"
+#include "prometheus/registry.h"
+
+static void BM_Info_Collect(benchmark::State& state) {
+  using prometheus::BuildInfo;
+  using prometheus::Info;
+  using prometheus::Registry;
+  Registry registry;
+  auto& info_family =
+      BuildInfo().Name("benchmark_info").Help("").Register(registry);
+  auto& info = info_family.Add({});
+
+  while (state.KeepRunning()) {
+    benchmark::DoNotOptimize(info.Collect());
+  };
+}
+BENCHMARK(BM_Info_Collect);
diff --git a/core/benchmarks/registry_bench.cc b/core/benchmarks/registry_bench.cc
index 7e483c7b..b33ddc4d 100644
--- a/core/benchmarks/registry_bench.cc
+++ b/core/benchmarks/registry_bench.cc
@@ -1,14 +1,16 @@
-#include <chrono>
-
 #include <benchmark/benchmark.h>
-#include <prometheus/registry.h>
+
+#include <chrono>
 
 #include "benchmark_helpers.h"
+#include "prometheus/counter.h"
+#include "prometheus/family.h"
+#include "prometheus/registry.h"
 
 static void BM_Registry_CreateFamily(benchmark::State& state) {
-  using prometheus::Registry;
-  using prometheus::Counter;
   using prometheus::BuildCounter;
+  using prometheus::Counter;
+  using prometheus::Registry;
   Registry registry;
 
   while (state.KeepRunning())
@@ -17,9 +19,9 @@ static void BM_Registry_CreateFamily(benchmark::State& state) {
 BENCHMARK(BM_Registry_CreateFamily);
 
 static void BM_Registry_CreateCounter(benchmark::State& state) {
-  using prometheus::Registry;
-  using prometheus::Counter;
   using prometheus::BuildCounter;
+  using prometheus::Counter;
+  using prometheus::Registry;
   Registry registry;
   auto& counter_family = BuildCounter()
                              .Labels(GenerateRandomLabels(10))
diff --git a/core/benchmarks/summary_bench.cc b/core/benchmarks/summary_bench.cc
index 40917eee..1a73807c 100644
--- a/core/benchmarks/summary_bench.cc
+++ b/core/benchmarks/summary_bench.cc
@@ -1,8 +1,14 @@
+#include <benchmark/benchmark.h>
+
+#include <algorithm>
 #include <chrono>
+#include <cmath>
 #include <random>
+#include <vector>
 
-#include <benchmark/benchmark.h>
-#include <prometheus/registry.h>
+#include "prometheus/family.h"
+#include "prometheus/registry.h"
+#include "prometheus/summary.h"
 
 using prometheus::Summary;
 
diff --git a/core/include/prometheus/check_names.h b/core/include/prometheus/check_names.h
index 7c69a80f..d3c6dd2c 100644
--- a/core/include/prometheus/check_names.h
+++ b/core/include/prometheus/check_names.h
@@ -2,8 +2,12 @@
 
 #include <string>
 
+#include "prometheus/detail/core_export.h"
+#include "prometheus/metric_type.h"
+
 namespace prometheus {
 
-bool CheckMetricName(const std::string& name);
-bool CheckLabelName(const std::string& name);
-}
+PROMETHEUS_CPP_CORE_EXPORT bool CheckMetricName(const std::string& name);
+PROMETHEUS_CPP_CORE_EXPORT bool CheckLabelName(const std::string& name,
+                                               MetricType type);
+}  // namespace prometheus
diff --git a/core/include/prometheus/client_metric.h b/core/include/prometheus/client_metric.h
index 4f04281a..ff4504cd 100644
--- a/core/include/prometheus/client_metric.h
+++ b/core/include/prometheus/client_metric.h
@@ -5,21 +5,23 @@
 #include <tuple>
 #include <vector>
 
+#include "prometheus/detail/core_export.h"
+
 namespace prometheus {
 
-struct ClientMetric {
+struct PROMETHEUS_CPP_CORE_EXPORT ClientMetric {
   // Label
 
   struct Label {
     std::string name;
     std::string value;
 
-    bool operator<(const Label& rhs) const {
-      return std::tie(name, value) < std::tie(rhs.name, rhs.value);
+    friend bool operator<(const Label& lhs, const Label& rhs) {
+      return std::tie(lhs.name, lhs.value) < std::tie(rhs.name, rhs.value);
     }
 
-    bool operator==(const Label& rhs) const {
-      return std::tie(name, value) == std::tie(rhs.name, rhs.value);
+    friend bool operator==(const Label& lhs, const Label& rhs) {
+      return std::tie(lhs.name, lhs.value) == std::tie(rhs.name, rhs.value);
     }
   };
   std::vector<Label> label;
@@ -38,6 +40,13 @@ struct ClientMetric {
   };
   Gauge gauge;
 
+  // Info
+
+  struct Info {
+    double value = 1.0;
+  };
+  Info info;
+
   // Summary
 
   struct Quantile {
diff --git a/core/include/prometheus/collectable.h b/core/include/prometheus/collectable.h
index 97ce02ab..e268e508 100644
--- a/core/include/prometheus/collectable.h
+++ b/core/include/prometheus/collectable.h
@@ -2,6 +2,8 @@
 
 #include <vector>
 
+#include "prometheus/detail/core_export.h"
+
 namespace prometheus {
 struct MetricFamily;
 }
@@ -12,12 +14,12 @@ namespace prometheus {
 /// collect metrics.
 ///
 /// A Collectable has to be registered for collection. See Registry.
-class Collectable {
+class PROMETHEUS_CPP_CORE_EXPORT Collectable {
  public:
   virtual ~Collectable() = default;
 
   /// \brief Returns a list of metrics and their samples.
-  virtual std::vector<MetricFamily> Collect() = 0;
+  virtual std::vector<MetricFamily> Collect() const = 0;
 };
 
 }  // namespace prometheus
diff --git a/core/include/prometheus/counter.h b/core/include/prometheus/counter.h
index ba8b1494..85a937e3 100644
--- a/core/include/prometheus/counter.h
+++ b/core/include/prometheus/counter.h
@@ -1,7 +1,8 @@
 #pragma once
 
 #include "prometheus/client_metric.h"
-#include "prometheus/detail/counter_builder.h"
+#include "prometheus/detail/builder.h"  // IWYU pragma: export
+#include "prometheus/detail/core_export.h"
 #include "prometheus/gauge.h"
 #include "prometheus/metric_type.h"
 
@@ -22,7 +23,7 @@ namespace prometheus {
 ///
 /// The class is thread-safe. No concurrent call to any API of this type causes
 /// a data race.
-class Counter {
+class PROMETHEUS_CPP_CORE_EXPORT Counter {
  public:
   static const MetricType metric_type{MetricType::Counter};
 
@@ -37,6 +38,9 @@ class Counter {
   /// The counter will not change if the given amount is negative.
   void Increment(double);
 
+  /// \brief Reset the counter to 0
+  void Reset();
+
   /// \brief Get the current value of the counter.
   double Value() const;
 
@@ -49,6 +53,33 @@ class Counter {
   Gauge gauge_{0.0};
 };
 
-detail::CounterBuilder BuildCounter();
+/// \brief Return a builder to configure and register a Counter metric.
+///
+/// @copydetails Family<>::Family()
+///
+/// Example usage:
+///
+/// \code
+/// auto registry = std::make_shared<Registry>();
+/// auto& counter_family = prometheus::BuildCounter()
+///                            .Name("some_name")
+///                            .Help("Additional description.")
+///                            .Labels({{"key", "value"}})
+///                            .Register(*registry);
+///
+/// ...
+/// \endcode
+///
+/// \return An object of unspecified type T, i.e., an implementation detail
+/// except that it has the following members:
+///
+/// - Name(const std::string&) to set the metric name,
+/// - Help(const std::string&) to set an additional description.
+/// - Labels(const Labels&) to assign a set of
+///   key-value pairs (= labels) to the metric.
+///
+/// To finish the configuration of the Counter metric, register it with
+/// Register(Registry&).
+PROMETHEUS_CPP_CORE_EXPORT detail::Builder<Counter> BuildCounter();
 
 }  // namespace prometheus
diff --git a/core/include/prometheus/detail/builder.h b/core/include/prometheus/detail/builder.h
new file mode 100644
index 00000000..48f52f89
--- /dev/null
+++ b/core/include/prometheus/detail/builder.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <string>
+
+#include "prometheus/labels.h"
+
+// IWYU pragma: private
+// IWYU pragma: no_include "prometheus/family.h"
+
+namespace prometheus {
+
+template <typename T>
+class Family;    // IWYU pragma: keep
+class Registry;  // IWYU pragma: keep
+
+namespace detail {
+
+template <typename T>
+class Builder {
+ public:
+  Builder& Labels(const ::prometheus::Labels& labels);
+  Builder& Name(const std::string&);
+  Builder& Help(const std::string&);
+  Family<T>& Register(Registry&);
+
+ private:
+  ::prometheus::Labels labels_;
+  std::string name_;
+  std::string help_;
+};
+
+}  // namespace detail
+}  // namespace prometheus
diff --git a/core/include/prometheus/detail/ckms_quantiles.h b/core/include/prometheus/detail/ckms_quantiles.h
index 2fe6fe22..771e816f 100644
--- a/core/include/prometheus/detail/ckms_quantiles.h
+++ b/core/include/prometheus/detail/ckms_quantiles.h
@@ -5,27 +5,31 @@
 #include <functional>
 #include <vector>
 
+#include "prometheus/detail/core_export.h"
+
+// IWYU pragma: private, include "prometheus/summary.h"
+
 namespace prometheus {
 namespace detail {
 
-class CKMSQuantiles {
+class PROMETHEUS_CPP_CORE_EXPORT CKMSQuantiles {
  public:
-  struct Quantile {
-    const double quantile;
-    const double error;
-    const double u;
-    const double v;
-
+  struct PROMETHEUS_CPP_CORE_EXPORT Quantile {
     Quantile(double quantile, double error);
+
+    double quantile;
+    double error;
+    double u;
+    double v;
   };
 
  private:
   struct Item {
-    /*const*/ double value;
+    double value;
     int g;
-    /*const*/ int delta;
+    int delta;
 
-    explicit Item(double value, int lower_delta, int delta);
+    Item(double value, int lower_delta, int delta);
   };
 
  public:
diff --git a/core/include/prometheus/detail/counter_builder.h b/core/include/prometheus/detail/counter_builder.h
deleted file mode 100644
index 5967a7c5..00000000
--- a/core/include/prometheus/detail/counter_builder.h
+++ /dev/null
@@ -1,29 +0,0 @@
-#pragma once
-
-#include <map>
-#include <string>
-
-namespace prometheus {
-
-template <typename T>
-class Family;
-class Counter;
-class Registry;
-
-namespace detail {
-
-class CounterBuilder {
- public:
-  CounterBuilder& Labels(const std::map<std::string, std::string>& labels);
-  CounterBuilder& Name(const std::string&);
-  CounterBuilder& Help(const std::string&);
-  Family<Counter>& Register(Registry&);
-
- private:
-  std::map<std::string, std::string> labels_;
-  std::string name_;
-  std::string help_;
-};
-
-}  // namespace detail
-}  // namespace prometheus
diff --git a/core/include/prometheus/detail/gauge_builder.h b/core/include/prometheus/detail/gauge_builder.h
deleted file mode 100644
index 2778ff85..00000000
--- a/core/include/prometheus/detail/gauge_builder.h
+++ /dev/null
@@ -1,29 +0,0 @@
-#pragma once
-
-#include <map>
-#include <string>
-
-namespace prometheus {
-
-template <typename T>
-class Family;
-class Gauge;
-class Registry;
-
-namespace detail {
-
-class GaugeBuilder {
- public:
-  GaugeBuilder& Labels(const std::map<std::string, std::string>& labels);
-  GaugeBuilder& Name(const std::string&);
-  GaugeBuilder& Help(const std::string&);
-  Family<Gauge>& Register(Registry&);
-
- private:
-  std::map<std::string, std::string> labels_;
-  std::string name_;
-  std::string help_;
-};
-
-}  // namespace detail
-}  // namespace prometheus
diff --git a/core/include/prometheus/detail/histogram_builder.h b/core/include/prometheus/detail/histogram_builder.h
deleted file mode 100644
index c2d9a1e4..00000000
--- a/core/include/prometheus/detail/histogram_builder.h
+++ /dev/null
@@ -1,29 +0,0 @@
-#pragma once
-
-#include <map>
-#include <string>
-
-namespace prometheus {
-
-template <typename T>
-class Family;
-class Histogram;
-class Registry;
-
-namespace detail {
-
-class HistogramBuilder {
- public:
-  HistogramBuilder& Labels(const std::map<std::string, std::string>& labels);
-  HistogramBuilder& Name(const std::string&);
-  HistogramBuilder& Help(const std::string&);
-  Family<Histogram>& Register(Registry&);
-
- private:
-  std::map<std::string, std::string> labels_;
-  std::string name_;
-  std::string help_;
-};
-
-}  // namespace detail
-}  // namespace prometheus
diff --git a/core/include/prometheus/detail/summary_builder.h b/core/include/prometheus/detail/summary_builder.h
deleted file mode 100644
index 1b8efa32..00000000
--- a/core/include/prometheus/detail/summary_builder.h
+++ /dev/null
@@ -1,29 +0,0 @@
-#pragma once
-
-#include <map>
-#include <string>
-
-namespace prometheus {
-
-template <typename T>
-class Family;
-class Summary;
-class Registry;
-
-namespace detail {
-
-class SummaryBuilder {
- public:
-  SummaryBuilder& Labels(const std::map<std::string, std::string>& labels);
-  SummaryBuilder& Name(const std::string&);
-  SummaryBuilder& Help(const std::string&);
-  Family<Summary>& Register(Registry&);
-
- private:
-  std::map<std::string, std::string> labels_;
-  std::string name_;
-  std::string help_;
-};
-
-}  // namespace detail
-}  // namespace prometheus
diff --git a/core/include/prometheus/detail/time_window_quantiles.h b/core/include/prometheus/detail/time_window_quantiles.h
index aeb42eeb..498baed2 100644
--- a/core/include/prometheus/detail/time_window_quantiles.h
+++ b/core/include/prometheus/detail/time_window_quantiles.h
@@ -4,29 +4,32 @@
 #include <cstddef>
 #include <vector>
 
-#include "prometheus/detail/ckms_quantiles.h"
+#include "prometheus/detail/ckms_quantiles.h"  // IWYU pragma: export
+#include "prometheus/detail/core_export.h"
+
+// IWYU pragma: private, include "prometheus/summary.h"
 
 namespace prometheus {
 namespace detail {
 
-class TimeWindowQuantiles {
+class PROMETHEUS_CPP_CORE_EXPORT TimeWindowQuantiles {
   using Clock = std::chrono::steady_clock;
 
  public:
   TimeWindowQuantiles(const std::vector<CKMSQuantiles::Quantile>& quantiles,
                       Clock::duration max_age_seconds, int age_buckets);
 
-  double get(double q);
+  double get(double q) const;
   void insert(double value);
 
  private:
-  CKMSQuantiles& rotate();
+  CKMSQuantiles& rotate() const;
 
   const std::vector<CKMSQuantiles::Quantile>& quantiles_;
-  std::vector<CKMSQuantiles> ckms_quantiles_;
-  std::size_t current_bucket_;
+  mutable std::vector<CKMSQuantiles> ckms_quantiles_;
+  mutable std::size_t current_bucket_;
 
-  Clock::time_point last_rotation_;
+  mutable Clock::time_point last_rotation_;
   const Clock::duration rotation_interval_;
 };
 
diff --git a/core/include/prometheus/detail/utils.h b/core/include/prometheus/detail/utils.h
new file mode 100644
index 00000000..5cea6bda
--- /dev/null
+++ b/core/include/prometheus/detail/utils.h
@@ -0,0 +1,22 @@
+#pragma once
+
+#include <cstddef>
+
+#include "prometheus/detail/core_export.h"
+#include "prometheus/labels.h"
+
+namespace prometheus {
+namespace detail {
+
+/// \brief Label hasher for use in STL containers.
+struct PROMETHEUS_CPP_CORE_EXPORT LabelHasher {
+  /// \brief Compute the hash value of a map of labels.
+  ///
+  /// \param labels The map that will be computed the hash value.
+  ///
+  /// \returns The hash value of the given labels.
+  std::size_t operator()(const Labels& labels) const;
+};
+
+}  // namespace detail
+}  // namespace prometheus
diff --git a/core/include/prometheus/family.h b/core/include/prometheus/family.h
index 1c884589..f5c887bb 100644
--- a/core/include/prometheus/family.h
+++ b/core/include/prometheus/family.h
@@ -1,23 +1,25 @@
 #pragma once
 
-#include <algorithm>
-#include <cassert>
-#include <cstddef>
-#include <map>
 #include <memory>
 #include <mutex>
-#include <numeric>
 #include <string>
 #include <unordered_map>
-#include <utility>
 #include <vector>
 
-#include "prometheus/check_names.h"
 #include "prometheus/client_metric.h"
 #include "prometheus/collectable.h"
+#include "prometheus/detail/core_export.h"
 #include "prometheus/detail/future_std.h"
+#include "prometheus/detail/utils.h"
+#include "prometheus/labels.h"
 #include "prometheus/metric_family.h"
 
+// IWYU pragma: no_include "prometheus/counter.h"
+// IWYU pragma: no_include "prometheus/gauge.h"
+// IWYU pragma: no_include "prometheus/histogram.h"
+// IWYU pragma: no_include "prometheus/info.h"
+// IWYU pragma: no_include "prometheus/summary.h"
+
 namespace prometheus {
 
 /// \brief A metric of type T with a set of labeled dimensions.
@@ -57,7 +59,7 @@ namespace prometheus {
 ///
 /// \tparam T One of the metric types Counter, Gauge, Histogram or Summary.
 template <typename T>
-class Family : public Collectable {
+class PROMETHEUS_CPP_CORE_EXPORT Family : public Collectable {
  public:
   /// \brief Create a new metric.
   ///
@@ -78,7 +80,7 @@ class Family : public Collectable {
   ///
   ///     http_requests_total{job= "prometheus"}
   ///
-  /// For further information see: [Quering Basics]
+  /// For further information see: [Querying Basics]
   /// (https://prometheus.io/docs/prometheus/latest/querying/basics/)
   ///
   /// \param name Set the metric name.
@@ -86,8 +88,9 @@ class Family : public Collectable {
   /// \param constant_labels Assign a set of key-value pairs (= labels) to the
   /// metric. All these labels are propagated to each time series within the
   /// metric.
+  /// \throw std::runtime_exception on invalid metric or label names.
   Family(const std::string& name, const std::string& help,
-         const std::map<std::string, std::string>& constant_labels);
+         const Labels& constant_labels);
 
   /// \brief Add a new dimensional data.
   ///
@@ -99,14 +102,17 @@ class Family : public Collectable {
   ///     http_requests_total{job= "prometheus",method= "POST"}
   ///
   /// \param labels Assign a set of key-value pairs (= labels) to the
-  /// dimensional data. The function does nothing, if the same set of lables
+  /// dimensional data. The function does nothing, if the same set of labels
   /// already exists.
   /// \param args Arguments are passed to the constructor of metric type T. See
   /// Counter, Gauge, Histogram or Summary for required constructor arguments.
   /// \return Return the newly created dimensional data or - if a same set of
-  /// lables already exists - the already existing dimensional data.
+  /// labels already exists - the already existing dimensional data.
+  /// \throw std::runtime_exception on invalid label names.
   template <typename... Args>
-  T& Add(const std::map<std::string, std::string>& labels, Args&&... args);
+  T& Add(const Labels& labels, Args&&... args) {
+    return Add(labels, detail::make_unique<T>(args...));
+  }
 
   /// \brief Remove the given dimensional data.
   ///
@@ -114,121 +120,38 @@ class Family : public Collectable {
   /// if the given metric was not returned by Add().
   void Remove(T* metric);
 
+  /// \brief Returns true if the dimensional data with the given labels exist
+  ///
+  /// \param labels A set of key-value pairs (= labels) of the dimensional data.
+  bool Has(const Labels& labels) const;
+
+  /// \brief Returns the name for this family.
+  ///
+  /// \return The family name.
+  const std::string& GetName() const;
+
+  /// \brief Returns the constant labels for this family.
+  ///
+  /// \return All constant labels as key-value pairs.
+  const Labels& GetConstantLabels() const;
+
   /// \brief Returns the current value of each dimensional data.
   ///
   /// Collect is called by the Registry when collecting metrics.
   ///
   /// \return Zero or more samples for each dimensional data.
-  std::vector<MetricFamily> Collect() override;
+  std::vector<MetricFamily> Collect() const override;
 
  private:
-  std::unordered_map<std::size_t, std::unique_ptr<T>> metrics_;
-  std::unordered_map<std::size_t, std::map<std::string, std::string>> labels_;
-  std::unordered_map<T*, std::size_t> labels_reverse_lookup_;
+  std::unordered_map<Labels, std::unique_ptr<T>, detail::LabelHasher> metrics_;
 
   const std::string name_;
   const std::string help_;
-  const std::map<std::string, std::string> constant_labels_;
-  std::mutex mutex_;
-
-  ClientMetric CollectMetric(std::size_t hash, T* metric);
+  const Labels constant_labels_;
+  mutable std::mutex mutex_;
 
-  static std::size_t hash_labels(
-      const std::map<std::string, std::string>& labels);
+  ClientMetric CollectMetric(const Labels& labels, T* metric) const;
+  T& Add(const Labels& labels, std::unique_ptr<T> object);
 };
 
-template <typename T>
-Family<T>::Family(const std::string& name, const std::string& help,
-                  const std::map<std::string, std::string>& constant_labels)
-    : name_(name), help_(help), constant_labels_(constant_labels) {
-  assert(CheckMetricName(name_));
-}
-
-template <typename T>
-template <typename... Args>
-T& Family<T>::Add(const std::map<std::string, std::string>& labels,
-                  Args&&... args) {
-#ifndef NDEBUG
-  for (auto& label_pair : labels) {
-    auto& label_name = label_pair.first;
-    assert(CheckLabelName(label_name));
-  }
-#endif
-
-  auto hash = hash_labels(labels);
-  std::lock_guard<std::mutex> lock{mutex_};
-  auto metrics_iter = metrics_.find(hash);
-
-  if (metrics_iter != metrics_.end()) {
-#ifndef NDEBUG
-    auto labels_iter = labels_.find(hash);
-    assert(labels_iter != labels_.end());
-    const auto& old_labels = labels_iter->second;
-    assert(labels == old_labels);
-#endif
-    return *metrics_iter->second;
-  } else {
-    auto metric =
-        metrics_.insert(std::make_pair(hash, detail::make_unique<T>(args...)));
-    assert(metric.second);
-    labels_.insert({hash, labels});
-    labels_reverse_lookup_.insert({metric.first->second.get(), hash});
-    return *(metric.first->second);
-  }
-}
-
-template <typename T>
-std::size_t Family<T>::hash_labels(
-    const std::map<std::string, std::string>& labels) {
-  auto combined = std::accumulate(
-      labels.begin(), labels.end(), std::string{},
-      [](const std::string& acc,
-         const std::pair<std::string, std::string>& label_pair) {
-        return acc + label_pair.first + label_pair.second;
-      });
-  return std::hash<std::string>{}(combined);
-}
-
-template <typename T>
-void Family<T>::Remove(T* metric) {
-  std::lock_guard<std::mutex> lock{mutex_};
-  if (labels_reverse_lookup_.count(metric) == 0) {
-    return;
-  }
-
-  auto hash = labels_reverse_lookup_.at(metric);
-  metrics_.erase(hash);
-  labels_.erase(hash);
-  labels_reverse_lookup_.erase(metric);
-}
-
-template <typename T>
-std::vector<MetricFamily> Family<T>::Collect() {
-  std::lock_guard<std::mutex> lock{mutex_};
-  auto family = MetricFamily{};
-  family.name = name_;
-  family.help = help_;
-  family.type = T::metric_type;
-  for (const auto& m : metrics_) {
-    family.metric.push_back(std::move(CollectMetric(m.first, m.second.get())));
-  }
-  return {family};
-}
-
-template <typename T>
-ClientMetric Family<T>::CollectMetric(std::size_t hash, T* metric) {
-  auto collected = metric->Collect();
-  auto add_label =
-      [&collected](const std::pair<std::string, std::string>& label_pair) {
-        auto label = ClientMetric::Label{};
-        label.name = label_pair.first;
-        label.value = label_pair.second;
-        collected.label.push_back(std::move(label));
-      };
-  std::for_each(constant_labels_.cbegin(), constant_labels_.cend(), add_label);
-  const auto& metric_labels = labels_.at(hash);
-  std::for_each(metric_labels.cbegin(), metric_labels.cend(), add_label);
-  return collected;
-}
-
 }  // namespace prometheus
diff --git a/core/include/prometheus/gauge.h b/core/include/prometheus/gauge.h
index 982d2a10..92c06d36 100644
--- a/core/include/prometheus/gauge.h
+++ b/core/include/prometheus/gauge.h
@@ -3,7 +3,8 @@
 #include <atomic>
 
 #include "prometheus/client_metric.h"
-#include "prometheus/detail/gauge_builder.h"
+#include "prometheus/detail/builder.h"  // IWYU pragma: export
+#include "prometheus/detail/core_export.h"
 #include "prometheus/metric_type.h"
 
 namespace prometheus {
@@ -20,7 +21,7 @@ namespace prometheus {
 ///
 /// The class is thread-safe. No concurrent call to any API of this type causes
 /// a data race.
-class Gauge {
+class PROMETHEUS_CPP_CORE_EXPORT Gauge {
  public:
   static const MetricType metric_type{MetricType::Gauge};
 
@@ -28,7 +29,7 @@ class Gauge {
   Gauge() = default;
 
   /// \brief Create a gauge that starts at the given amount.
-  Gauge(double);
+  explicit Gauge(double);
 
   /// \brief Increment the gauge by 1.
   void Increment();
@@ -45,7 +46,7 @@ class Gauge {
   /// \brief Set the gauge to the given value.
   void Set(double);
 
-  /// \brief Set the gauge to the current unixtime in seconds.
+  /// \brief Set the gauge to the current unix time in seconds.
   void SetToCurrentTime();
 
   /// \brief Get the current value of the gauge.
@@ -61,6 +62,33 @@ class Gauge {
   std::atomic<double> value_{0.0};
 };
 
-detail::GaugeBuilder BuildGauge();
+/// \brief Return a builder to configure and register a Gauge metric.
+///
+/// @copydetails Family<>::Family()
+///
+/// Example usage:
+///
+/// \code
+/// auto registry = std::make_shared<Registry>();
+/// auto& gauge_family = prometheus::BuildGauge()
+///                          .Name("some_name")
+///                          .Help("Additional description.")
+///                          .Labels({{"key", "value"}})
+///                          .Register(*registry);
+///
+/// ...
+/// \endcode
+///
+/// \return An object of unspecified type T, i.e., an implementation detail
+/// except that it has the following members:
+///
+/// - Name(const std::string&) to set the metric name,
+/// - Help(const std::string&) to set an additional description.
+/// - Labels(const Labels&) to assign a set of
+///   key-value pairs (= labels) to the metric.
+///
+/// To finish the configuration of the Gauge metric register it with
+/// Register(Registry&).
+PROMETHEUS_CPP_CORE_EXPORT detail::Builder<Gauge> BuildGauge();
 
 }  // namespace prometheus
diff --git a/core/include/prometheus/histogram.h b/core/include/prometheus/histogram.h
index 4216a78b..f5e7aae3 100644
--- a/core/include/prometheus/histogram.h
+++ b/core/include/prometheus/histogram.h
@@ -1,10 +1,13 @@
 #pragma once
 
+#include <mutex>
 #include <vector>
 
 #include "prometheus/client_metric.h"
 #include "prometheus/counter.h"
-#include "prometheus/detail/histogram_builder.h"
+#include "prometheus/detail/builder.h"  // IWYU pragma: export
+#include "prometheus/detail/core_export.h"
+#include "prometheus/gauge.h"
 #include "prometheus/metric_type.h"
 
 namespace prometheus {
@@ -18,20 +21,20 @@ namespace prometheus {
 /// values, allowing to calculate the average of the observed values.
 ///
 /// At its core a histogram has a counter per bucket. The sum of observations
-/// also behaves like a counter.
+/// also behaves like a counter as long as there are no negative observations.
 ///
 /// See https://prometheus.io/docs/practices/histograms/ for detailed
 /// explanations of histogram usage and differences to summaries.
 ///
 /// The class is thread-safe. No concurrent call to any API of this type causes
 /// a data race.
-class Histogram {
+class PROMETHEUS_CPP_CORE_EXPORT Histogram {
  public:
   using BucketBoundaries = std::vector<double>;
 
   static const MetricType metric_type{MetricType::Histogram};
 
-  /// \brief Create a histogram with manually choosen buckets.
+  /// \brief Create a histogram with manually chosen buckets.
   ///
   /// The BucketBoundaries are a list of monotonically increasing values
   /// representing the bucket boundaries. Each consecutive pair of values is
@@ -41,7 +44,10 @@ class Histogram {
   /// exponential etc..
   ///
   /// The bucket boundaries cannot be changed once the histogram is created.
-  Histogram(const BucketBoundaries& buckets);
+  explicit Histogram(const BucketBoundaries& buckets);
+
+  /// \copydoc Histogram::Histogram(const BucketBoundaries&)
+  explicit Histogram(BucketBoundaries&& buckets);
 
   /// \brief Observe the given amount.
   ///
@@ -51,17 +57,59 @@ class Histogram {
   /// sum of all observations is incremented.
   void Observe(double value);
 
-  /// \brief Get the current value of the counter.
+  /// \brief Observe multiple data points.
+  ///
+  /// Increments counters given a count for each bucket. (i.e. the caller of
+  /// this function must have already sorted the values into buckets).
+  /// Also increments the total sum of all observations by the given value.
+  void ObserveMultiple(const std::vector<double>& bucket_increments,
+                       double sum_of_values);
+
+  /// \brief Reset all data points collected so far.
+  ///
+  /// All buckets and sum are reset to its oringal value. This is especially
+  /// useful if histogram is tracked elsewhere but report in prometheus system.
+  void Reset();
+
+  /// \brief Get the current value of the histogram.
   ///
   /// Collect is called by the Registry when collecting metrics.
   ClientMetric Collect() const;
 
  private:
-  const BucketBoundaries bucket_boundaries_;
+  BucketBoundaries bucket_boundaries_;
+  mutable std::mutex mutex_;
   std::vector<Counter> bucket_counts_;
-  Counter sum_;
+  Gauge sum_;
 };
 
-detail::HistogramBuilder BuildHistogram();
+/// \brief Return a builder to configure and register a Histogram metric.
+///
+/// @copydetails Family<>::Family()
+///
+/// Example usage:
+///
+/// \code
+/// auto registry = std::make_shared<Registry>();
+/// auto& histogram_family = prometheus::BuildHistogram()
+///                              .Name("some_name")
+///                              .Help("Additional description.")
+///                              .Labels({{"key", "value"}})
+///                              .Register(*registry);
+///
+/// ...
+/// \endcode
+///
+/// \return An object of unspecified type T, i.e., an implementation detail
+/// except that it has the following members:
+///
+/// - Name(const std::string&) to set the metric name,
+/// - Help(const std::string&) to set an additional description.
+/// - Labels(const Labels&) to assign a set of
+///   key-value pairs (= labels) to the metric.
+///
+/// To finish the configuration of the Histogram metric register it with
+/// Register(Registry&).
+PROMETHEUS_CPP_CORE_EXPORT detail::Builder<Histogram> BuildHistogram();
 
 }  // namespace prometheus
diff --git a/core/include/prometheus/info.h b/core/include/prometheus/info.h
new file mode 100644
index 00000000..f54dbf05
--- /dev/null
+++ b/core/include/prometheus/info.h
@@ -0,0 +1,68 @@
+#pragma once
+
+#include "prometheus/client_metric.h"
+#include "prometheus/detail/builder.h"  // IWYU pragma: export
+#include "prometheus/detail/core_export.h"
+#include "prometheus/metric_type.h"
+
+namespace prometheus {
+
+/// \brief A info metric to represent textual information which should not
+/// change during process lifetime.
+///
+/// This class represents the metric type info:
+/// https://github.com/OpenObservability/OpenMetrics/blob/98ae26c87b1c3bcf937909a880b32c8be643cc9b/specification/OpenMetrics.md#info
+
+/// Prometheus does not provide this type directly, it is used by emulating a
+/// gauge with value 1: https://prometheus.io/docs/concepts/metric_types/#gauge
+///
+/// The value of the info cannot change. Example of infos are:
+/// - the application's version
+/// - revision control commit
+/// - version of the compiler
+///
+/// The class is thread-safe. No concurrent call to any API of this type causes
+/// a data race.
+class PROMETHEUS_CPP_CORE_EXPORT Info {
+ public:
+  static const MetricType metric_type{MetricType::Info};
+
+  /// \brief Create a info.
+  Info() = default;
+
+  /// \brief Get the current value of the info.
+  ///
+  /// Collect is called by the Registry when collecting metrics.
+  ClientMetric Collect() const;
+};
+
+/// \brief Return a builder to configure and register a Info metric.
+///
+/// @copydetails Family<>::Family()
+///
+/// Example usage:
+///
+/// \code
+/// auto registry = std::make_shared<Registry>();
+/// auto& info_family = prometheus::BuildInfo()
+///                            .Name("some_name")
+///                            .Help("Additional description.")
+///                            .Labels({{"key", "value"}})
+///                            .Register(*registry);
+///
+/// ...
+/// \endcode
+///
+/// \return An object of unspecified type T, i.e., an implementation detail
+/// except that it has the following members:
+///
+/// - Name(const std::string&) to set the metric name,
+/// - Help(const std::string&) to set an additional description.
+/// - Labels(const Labels&) to assign a set of
+///   key-value pairs (= labels) to the metric.
+///
+/// To finish the configuration of the Info metric, register it with
+/// Register(Registry&).
+PROMETHEUS_CPP_CORE_EXPORT detail::Builder<Info> BuildInfo();
+
+}  // namespace prometheus
diff --git a/core/include/prometheus/labels.h b/core/include/prometheus/labels.h
new file mode 100644
index 00000000..d6fce0ff
--- /dev/null
+++ b/core/include/prometheus/labels.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <map>
+#include <string>
+
+namespace prometheus {
+
+/// \brief Multiple labels and their value.
+using Labels = std::map<std::string, std::string>;
+
+/// \brief Single label and its value.
+using Label = Labels::value_type;
+
+}  // namespace prometheus
diff --git a/core/include/prometheus/metric_family.h b/core/include/prometheus/metric_family.h
index da913a45..1ba3f5a3 100644
--- a/core/include/prometheus/metric_family.h
+++ b/core/include/prometheus/metric_family.h
@@ -4,11 +4,12 @@
 #include <vector>
 
 #include "prometheus/client_metric.h"
+#include "prometheus/detail/core_export.h"
 #include "prometheus/metric_type.h"
 
 namespace prometheus {
 
-struct MetricFamily {
+struct PROMETHEUS_CPP_CORE_EXPORT MetricFamily {
   std::string name;
   std::string help;
   MetricType type = MetricType::Untyped;
diff --git a/core/include/prometheus/metric_type.h b/core/include/prometheus/metric_type.h
index bd5c77f0..ec69fb2f 100644
--- a/core/include/prometheus/metric_type.h
+++ b/core/include/prometheus/metric_type.h
@@ -8,6 +8,7 @@ enum class MetricType {
   Summary,
   Untyped,
   Histogram,
+  Info,
 };
 
 }  // namespace prometheus
diff --git a/core/include/prometheus/registry.h b/core/include/prometheus/registry.h
index cc901073..6603f6c6 100644
--- a/core/include/prometheus/registry.h
+++ b/core/include/prometheus/registry.h
@@ -1,26 +1,30 @@
 #pragma once
 
-#include <map>
 #include <memory>
 #include <mutex>
 #include <string>
 #include <vector>
 
 #include "prometheus/collectable.h"
-#include "prometheus/counter.h"
-#include "prometheus/detail/counter_builder.h"
-#include "prometheus/detail/future_std.h"
-#include "prometheus/detail/gauge_builder.h"
-#include "prometheus/detail/histogram_builder.h"
-#include "prometheus/detail/summary_builder.h"
+#include "prometheus/detail/core_export.h"
 #include "prometheus/family.h"
-#include "prometheus/gauge.h"
-#include "prometheus/histogram.h"
+#include "prometheus/labels.h"
 #include "prometheus/metric_family.h"
-#include "prometheus/summary.h"
 
 namespace prometheus {
 
+class Counter;
+class Gauge;
+class Histogram;
+class Info;
+class Summary;
+
+namespace detail {
+
+template <typename T>
+class Builder;  // IWYU pragma: keep
+
+}
 /// \brief Manages the collection of a number of metrics.
 ///
 /// The Registry is responsible to expose data to a class/method/function
@@ -30,42 +34,87 @@ namespace prometheus {
 /// that returns zero or more metrics and their samples. The metrics are
 /// represented by the class Family<>, which implements the Collectable
 /// interface. A new metric is registered with BuildCounter(), BuildGauge(),
-/// BuildHistogram() or BuildSummary().
+/// BuildHistogram(), BuildInfo() or BuildSummary().
 ///
 /// The class is thread-safe. No concurrent call to any API of this type causes
 /// a data race.
-class Registry : public Collectable {
+class PROMETHEUS_CPP_CORE_EXPORT Registry : public Collectable {
  public:
+  /// \brief How to deal with repeatedly added family names for a type.
+  ///
+  /// Adding a family with the same name but different types is always an error
+  /// and will lead to an exception.
+  enum class InsertBehavior {
+    /// \brief If a family with the same name and labels already exists return
+    /// the existing one. If no family with that name exists create it.
+    /// Otherwise throw.
+    Merge,
+    /// \brief Throws if a family with the same name already exists.
+    Throw,
+  };
+
+  /// \brief name Create a new registry.
+  ///
+  /// \param insert_behavior How to handle families with the same name.
+  explicit Registry(InsertBehavior insert_behavior = InsertBehavior::Merge);
+
+  /// \brief Deleted copy constructor.
+  Registry(const Registry&) = delete;
+
+  /// \brief Deleted copy assignment.
+  Registry& operator=(const Registry&) = delete;
+
+  /// \brief Deleted move constructor.
+  Registry(Registry&&) = delete;
+
+  /// \brief Deleted move assignment.
+  Registry& operator=(Registry&&) = delete;
+
+  /// \brief name Destroys a registry.
+  ~Registry() override;
+
   /// \brief Returns a list of metrics and their samples.
   ///
   /// Every time the Registry is scraped it calls each of the metrics Collect
   /// function.
   ///
   /// \return Zero or more metrics and their samples.
-  std::vector<MetricFamily> Collect() override;
+  std::vector<MetricFamily> Collect() const override;
+
+  /// \brief Removes a metrics family from the registry.
+  ///
+  /// Please note that this operation invalidates the previously
+  /// returned reference to the Family and all of their added
+  /// metric objects.
+  ///
+  /// \tparam T One of the metric types Counter, Gauge, Histogram or Summary.
+  /// \param family The family to remove
+  ///
+  /// \return True if the family was found and removed.
+  template <typename T>
+  bool Remove(const Family<T>& family);
 
  private:
-  friend class detail::CounterBuilder;
-  friend class detail::GaugeBuilder;
-  friend class detail::HistogramBuilder;
-  friend class detail::SummaryBuilder;
+  template <typename T>
+  friend class detail::Builder;
+
+  template <typename T>
+  std::vector<std::unique_ptr<Family<T>>>& GetFamilies();
+
+  template <typename T>
+  bool NameExistsInOtherType(const std::string& name) const;
 
   template <typename T>
   Family<T>& Add(const std::string& name, const std::string& help,
-                 const std::map<std::string, std::string>& labels);
+                 const Labels& labels);
 
-  std::vector<std::unique_ptr<Collectable>> collectables_;
-  std::mutex mutex_;
+  const InsertBehavior insert_behavior_;
+  std::vector<std::unique_ptr<Family<Counter>>> counters_;
+  std::vector<std::unique_ptr<Family<Gauge>>> gauges_;
+  std::vector<std::unique_ptr<Family<Histogram>>> histograms_;
+  std::vector<std::unique_ptr<Family<Info>>> infos_;
+  std::vector<std::unique_ptr<Family<Summary>>> summaries_;
+  mutable std::mutex mutex_;
 };
 
-template <typename T>
-Family<T>& Registry::Add(const std::string& name, const std::string& help,
-                         const std::map<std::string, std::string>& labels) {
-  std::lock_guard<std::mutex> lock{mutex_};
-  auto family = detail::make_unique<Family<T>>(name, help, labels);
-  auto& ref = *family;
-  collectables_.push_back(std::move(family));
-  return ref;
-}
-
 }  // namespace prometheus
diff --git a/core/include/prometheus/serializer.h b/core/include/prometheus/serializer.h
index 576109a4..c55ae096 100644
--- a/core/include/prometheus/serializer.h
+++ b/core/include/prometheus/serializer.h
@@ -1,14 +1,15 @@
 #pragma once
 
-#include <ostream>
+#include <iosfwd>
 #include <string>
 #include <vector>
 
+#include "prometheus/detail/core_export.h"
 #include "prometheus/metric_family.h"
 
 namespace prometheus {
 
-class Serializer {
+class PROMETHEUS_CPP_CORE_EXPORT Serializer {
  public:
   virtual ~Serializer() = default;
   virtual std::string Serialize(const std::vector<MetricFamily>&) const;
diff --git a/core/include/prometheus/summary.h b/core/include/prometheus/summary.h
index 766e64ef..7035459b 100644
--- a/core/include/prometheus/summary.h
+++ b/core/include/prometheus/summary.h
@@ -6,8 +6,9 @@
 #include <vector>
 
 #include "prometheus/client_metric.h"
+#include "prometheus/detail/builder.h"  // IWYU pragma: export
 #include "prometheus/detail/ckms_quantiles.h"
-#include "prometheus/detail/summary_builder.h"
+#include "prometheus/detail/core_export.h"
 #include "prometheus/detail/time_window_quantiles.h"
 #include "prometheus/metric_type.h"
 
@@ -37,7 +38,7 @@ namespace prometheus {
 ///
 /// The class is thread-safe. No concurrent call to any API of this type causes
 /// a data race.
-class Summary {
+class PROMETHEUS_CPP_CORE_EXPORT Summary {
  public:
   using Quantiles = std::vector<detail::CKMSQuantiles::Quantile>;
 
@@ -70,9 +71,14 @@ class Summary {
   /// and how smooth the time window is moved. With only one age bucket it
   /// effectively results in a complete reset of the summary each time max_age
   /// has passed. The default value is 5.
-  Summary(const Quantiles& quantiles,
-          std::chrono::milliseconds max_age = std::chrono::seconds{60},
-          int age_buckets = 5);
+  explicit Summary(const Quantiles& quantiles,
+                   std::chrono::milliseconds max_age = std::chrono::seconds{60},
+                   int age_buckets = 5);
+
+  /// \copydoc Summary::Summary(const Quantiles&,std::chrono::milliseconds,int)
+  explicit Summary(Quantiles&& quantiles,
+                   std::chrono::milliseconds max_age = std::chrono::seconds{60},
+                   int age_buckets = 5);
 
   /// \brief Observe the given amount.
   void Observe(double value);
@@ -80,16 +86,43 @@ class Summary {
   /// \brief Get the current value of the summary.
   ///
   /// Collect is called by the Registry when collecting metrics.
-  ClientMetric Collect();
+  ClientMetric Collect() const;
 
  private:
-  const Quantiles quantiles_;
-  std::mutex mutex_;
-  std::uint64_t count_;
-  double sum_;
+  Quantiles quantiles_;
+  mutable std::mutex mutex_;
+  std::uint64_t count_{};
+  double sum_{};
   detail::TimeWindowQuantiles quantile_values_;
 };
 
-detail::SummaryBuilder BuildSummary();
+/// \brief Return a builder to configure and register a Summary metric.
+///
+/// @copydetails Family<>::Family()
+///
+/// Example usage:
+///
+/// \code
+/// auto registry = std::make_shared<Registry>();
+/// auto& summary_family = prometheus::BuildSummary()
+///                            .Name("some_name")
+///                            .Help("Additional description.")
+///                            .Labels({{"key", "value"}})
+///                            .Register(*registry);
+///
+/// ...
+/// \endcode
+///
+/// \return An object of unspecified type T, i.e., an implementation detail
+/// except that it has the following members:
+///
+/// - Name(const std::string&) to set the metric name,
+/// - Help(const std::string&) to set an additional description.
+/// - Labels(const Labels&) to assign a set of
+///   key-value pairs (= labels) to the metric.
+///
+/// To finish the configuration of the Summary metric register it with
+/// Register(Registry&).
+PROMETHEUS_CPP_CORE_EXPORT detail::Builder<Summary> BuildSummary();
 
 }  // namespace prometheus
diff --git a/core/include/prometheus/text_serializer.h b/core/include/prometheus/text_serializer.h
index a2061e23..315a164d 100644
--- a/core/include/prometheus/text_serializer.h
+++ b/core/include/prometheus/text_serializer.h
@@ -1,15 +1,15 @@
 #pragma once
 
-#include <ostream>
-#include <string>
+#include <iosfwd>
 #include <vector>
 
+#include "prometheus/detail/core_export.h"
 #include "prometheus/metric_family.h"
 #include "prometheus/serializer.h"
 
 namespace prometheus {
 
-class TextSerializer : public Serializer {
+class PROMETHEUS_CPP_CORE_EXPORT TextSerializer : public Serializer {
  public:
   using Serializer::Serialize;
   void Serialize(std::ostream& out,
diff --git a/core/src/check_names.cc b/core/src/check_names.cc
index 5a1443ae..804ffc4a 100644
--- a/core/src/check_names.cc
+++ b/core/src/check_names.cc
@@ -1,37 +1,85 @@
 
 #include "prometheus/check_names.h"
 
-#include <regex>
-
-#if defined(__GLIBCXX__) && __GLIBCXX__ <= 20150623
-#define STD_REGEX_IS_BROKEN
-#endif
-#if defined(_MSC_VER) && _MSC_VER < 1900
-#define STD_REGEX_IS_BROKEN
-#endif
+#include <algorithm>
+#include <iterator>
 
 namespace prometheus {
-bool CheckMetricName(const std::string& name) {
-  // see https://prometheus.io/docs/concepts/data_model/
-  auto reserved_for_internal_purposes = name.compare(0, 2, "__") == 0;
-  if (reserved_for_internal_purposes) return false;
-#ifdef STD_REGEX_IS_BROKEN
-  return !name.empty();
-#else
-  static const std::regex metric_name_regex("[a-zA-Z_:][a-zA-Z0-9_:]*");
-  return std::regex_match(name, metric_name_regex);
-#endif
+
+namespace {
+bool isLocaleIndependentAlphaNumeric(char c) {
+  return ('0' <= c && c <= '9') || ('a' <= c && c <= 'z') ||
+         ('A' <= c && c <= 'Z');
 }
 
-bool CheckLabelName(const std::string& name) {
-  // see https://prometheus.io/docs/concepts/data_model/
+bool isLocaleIndependentDigit(char c) { return '0' <= c && c <= '9'; }
+
+bool nameStartsValid(const std::string& name) {
+  // must not be empty
+  if (name.empty()) {
+    return false;
+  }
+
+  // must not start with a digit
+  if (isLocaleIndependentDigit(name.front())) {
+    return false;
+  }
+
+  // must not start with "__"
   auto reserved_for_internal_purposes = name.compare(0, 2, "__") == 0;
   if (reserved_for_internal_purposes) return false;
-#ifdef STD_REGEX_IS_BROKEN
-  return !name.empty();
-#else
-  static const std::regex label_name_regex("[a-zA-Z_][a-zA-Z0-9_]*");
-  return std::regex_match(name, label_name_regex);
-#endif
+
+  return true;
+}
+}  // anonymous namespace
+
+/// \brief Check if the metric name is valid
+///
+/// The metric name regex is "[a-zA-Z_:][a-zA-Z0-9_:]*"
+///
+/// \see https://prometheus.io/docs/concepts/data_model/
+///
+/// \param name metric name
+/// \return true is valid, false otherwise
+bool CheckMetricName(const std::string& name) {
+  if (!nameStartsValid(name)) {
+    return false;
+  }
+
+  auto validMetricCharacters = [](char c) {
+    return isLocaleIndependentAlphaNumeric(c) || c == '_' || c == ':';
+  };
+
+  auto mismatch =
+      std::find_if_not(std::begin(name), std::end(name), validMetricCharacters);
+  return mismatch == std::end(name);
+}
+
+/// \brief Check if the label name is valid
+///
+/// The label name regex is "[a-zA-Z_][a-zA-Z0-9_]*"
+///
+/// \see https://prometheus.io/docs/concepts/data_model/
+///
+/// \param name label name
+/// \param type metric type
+/// \return true is valid, false otherwise
+bool CheckLabelName(const std::string& name, MetricType type) {
+  if (!nameStartsValid(name)) {
+    return false;
+  }
+
+  auto validLabelCharacters = [](char c) {
+    return isLocaleIndependentAlphaNumeric(c) || c == '_';
+  };
+
+  if ((type == MetricType::Histogram && name == "le") ||
+      (type == MetricType::Summary && name == "quantile")) {
+    return false;
+  }
+
+  auto mismatch =
+      std::find_if_not(std::begin(name), std::end(name), validLabelCharacters);
+  return mismatch == std::end(name);
 }
 }  // namespace prometheus
diff --git a/core/src/counter.cc b/core/src/counter.cc
index db2824d9..61e27717 100644
--- a/core/src/counter.cc
+++ b/core/src/counter.cc
@@ -4,16 +4,21 @@ namespace prometheus {
 
 void Counter::Increment() { gauge_.Increment(); }
 
-void Counter::Increment(const double val) { gauge_.Increment(val); }
+void Counter::Increment(const double val) {
+  if (val < 0.0) {
+    return;
+  }
+  gauge_.Increment(val);
+}
 
 double Counter::Value() const { return gauge_.Value(); }
 
+void Counter::Reset() { gauge_.Set(0); }
+
 ClientMetric Counter::Collect() const {
   ClientMetric metric;
   metric.counter.value = Value();
   return metric;
 }
 
-detail::CounterBuilder BuildCounter() { return {}; }
-
 }  // namespace prometheus
diff --git a/core/src/detail/builder.cc b/core/src/detail/builder.cc
new file mode 100644
index 00000000..e66dde06
--- /dev/null
+++ b/core/src/detail/builder.cc
@@ -0,0 +1,52 @@
+#include "prometheus/detail/builder.h"
+
+#include "prometheus/counter.h"
+#include "prometheus/detail/core_export.h"
+#include "prometheus/gauge.h"
+#include "prometheus/histogram.h"
+#include "prometheus/info.h"
+#include "prometheus/registry.h"
+#include "prometheus/summary.h"
+
+namespace prometheus {
+
+namespace detail {
+
+template <typename T>
+Builder<T>& Builder<T>::Labels(const ::prometheus::Labels& labels) {
+  labels_ = labels;
+  return *this;
+}
+
+template <typename T>
+Builder<T>& Builder<T>::Name(const std::string& name) {
+  name_ = name;
+  return *this;
+}
+
+template <typename T>
+Builder<T>& Builder<T>::Help(const std::string& help) {
+  help_ = help;
+  return *this;
+}
+
+template <typename T>
+Family<T>& Builder<T>::Register(Registry& registry) {
+  return registry.Add<T>(name_, help_, labels_);
+}
+
+template class PROMETHEUS_CPP_CORE_EXPORT Builder<Counter>;
+template class PROMETHEUS_CPP_CORE_EXPORT Builder<Gauge>;
+template class PROMETHEUS_CPP_CORE_EXPORT Builder<Histogram>;
+template class PROMETHEUS_CPP_CORE_EXPORT Builder<Info>;
+template class PROMETHEUS_CPP_CORE_EXPORT Builder<Summary>;
+
+}  // namespace detail
+
+detail::Builder<Counter> BuildCounter() { return {}; }
+detail::Builder<Gauge> BuildGauge() { return {}; }
+detail::Builder<Histogram> BuildHistogram() { return {}; }
+detail::Builder<Info> BuildInfo() { return {}; }
+detail::Builder<Summary> BuildSummary() { return {}; }
+
+}  // namespace prometheus
diff --git a/core/src/detail/ckms_quantiles.cc b/core/src/detail/ckms_quantiles.cc
index 63205dbc..7ab6f1f2 100644
--- a/core/src/detail/ckms_quantiles.cc
+++ b/core/src/detail/ckms_quantiles.cc
@@ -1,8 +1,9 @@
-#include "prometheus/detail/ckms_quantiles.h"
+#include "prometheus/detail/ckms_quantiles.h"  // IWYU pragma: export
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
+#include <memory>
 
 namespace prometheus {
 namespace detail {
diff --git a/core/src/detail/counter_builder.cc b/core/src/detail/counter_builder.cc
deleted file mode 100644
index 970b3def..00000000
--- a/core/src/detail/counter_builder.cc
+++ /dev/null
@@ -1,29 +0,0 @@
-#include "prometheus/detail/counter_builder.h"
-
-#include "prometheus/registry.h"
-
-namespace prometheus {
-namespace detail {
-
-CounterBuilder& CounterBuilder::Labels(
-    const std::map<std::string, std::string>& labels) {
-  labels_ = labels;
-  return *this;
-}
-
-CounterBuilder& CounterBuilder::Name(const std::string& name) {
-  name_ = name;
-  return *this;
-}
-
-CounterBuilder& CounterBuilder::Help(const std::string& help) {
-  help_ = help;
-  return *this;
-}
-
-Family<Counter>& CounterBuilder::Register(Registry& registry) {
-  return registry.Add<Counter>(name_, help_, labels_);
-}
-
-}  // namespace detail
-}  // namespace prometheus
diff --git a/core/src/detail/gauge_builder.cc b/core/src/detail/gauge_builder.cc
deleted file mode 100644
index 20e37b16..00000000
--- a/core/src/detail/gauge_builder.cc
+++ /dev/null
@@ -1,29 +0,0 @@
-#include "prometheus/detail/gauge_builder.h"
-
-#include "prometheus/registry.h"
-
-namespace prometheus {
-namespace detail {
-
-GaugeBuilder& GaugeBuilder::Labels(
-    const std::map<std::string, std::string>& labels) {
-  labels_ = labels;
-  return *this;
-}
-
-GaugeBuilder& GaugeBuilder::Name(const std::string& name) {
-  name_ = name;
-  return *this;
-}
-
-GaugeBuilder& GaugeBuilder::Help(const std::string& help) {
-  help_ = help;
-  return *this;
-}
-
-Family<Gauge>& GaugeBuilder::Register(Registry& registry) {
-  return registry.Add<Gauge>(name_, help_, labels_);
-}
-
-}  // namespace detail
-}  // namespace prometheus
diff --git a/core/src/detail/hash.h b/core/src/detail/hash.h
new file mode 100644
index 00000000..0b465fff
--- /dev/null
+++ b/core/src/detail/hash.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#include <cstddef>
+#include <functional>
+
+namespace prometheus {
+
+namespace detail {
+
+/// \brief Combine a hash value with nothing.
+/// It's the boundary condition of this serial functions.
+///
+/// \param seed Not effect.
+inline void hash_combine(std::size_t*) {}
+
+/// \brief Combine the given hash value with another object.
+///
+/// \param seed The given hash value. It's a input/output parameter.
+/// \param value The object that will be combined with the given hash value.
+template <typename T>
+inline void hash_combine(std::size_t* seed, const T& value) {
+  *seed ^= std::hash<T>{}(value) + 0x9e3779b9 + (*seed << 6) + (*seed >> 2);
+}
+
+/// \brief Combine the given hash value with another objects. It's a recursion。
+///
+/// \param seed The give hash value. It's a input/output parameter.
+/// \param value The object that will be combined with the given hash value.
+/// \param args The objects that will be combined with the given hash value.
+template <typename T, typename... Types>
+inline void hash_combine(std::size_t* seed, const T& value,
+                         const Types&... args) {
+  hash_combine(seed, value);
+  hash_combine(seed, args...);
+}
+
+}  // namespace detail
+
+}  // namespace prometheus
diff --git a/core/src/detail/histogram_builder.cc b/core/src/detail/histogram_builder.cc
deleted file mode 100644
index c038e8ce..00000000
--- a/core/src/detail/histogram_builder.cc
+++ /dev/null
@@ -1,29 +0,0 @@
-#include "prometheus/detail/histogram_builder.h"
-
-#include "prometheus/registry.h"
-
-namespace prometheus {
-namespace detail {
-
-HistogramBuilder& HistogramBuilder::Labels(
-    const std::map<std::string, std::string>& labels) {
-  labels_ = labels;
-  return *this;
-}
-
-HistogramBuilder& HistogramBuilder::Name(const std::string& name) {
-  name_ = name;
-  return *this;
-}
-
-HistogramBuilder& HistogramBuilder::Help(const std::string& help) {
-  help_ = help;
-  return *this;
-}
-
-Family<Histogram>& HistogramBuilder::Register(Registry& registry) {
-  return registry.Add<Histogram>(name_, help_, labels_);
-}
-
-}  // namespace detail
-}  // namespace prometheus
diff --git a/core/src/detail/summary_builder.cc b/core/src/detail/summary_builder.cc
deleted file mode 100644
index 20a3c70b..00000000
--- a/core/src/detail/summary_builder.cc
+++ /dev/null
@@ -1,29 +0,0 @@
-#include "prometheus/detail/summary_builder.h"
-
-#include "prometheus/registry.h"
-
-namespace prometheus {
-namespace detail {
-
-SummaryBuilder& SummaryBuilder::Labels(
-    const std::map<std::string, std::string>& labels) {
-  labels_ = labels;
-  return *this;
-}
-
-SummaryBuilder& SummaryBuilder::Name(const std::string& name) {
-  name_ = name;
-  return *this;
-}
-
-SummaryBuilder& SummaryBuilder::Help(const std::string& help) {
-  help_ = help;
-  return *this;
-}
-
-Family<Summary>& SummaryBuilder::Register(Registry& registry) {
-  return registry.Add<Summary>(name_, help_, labels_);
-}
-
-}  // namespace detail
-}  // namespace prometheus
diff --git a/core/src/detail/time_window_quantiles.cc b/core/src/detail/time_window_quantiles.cc
index eec6f2d3..57f1e1c6 100644
--- a/core/src/detail/time_window_quantiles.cc
+++ b/core/src/detail/time_window_quantiles.cc
@@ -1,4 +1,7 @@
-#include "prometheus/detail/time_window_quantiles.h"
+#include "prometheus/detail/time_window_quantiles.h"  // IWYU pragma: export
+
+#include <memory>
+#include <ratio>
 
 namespace prometheus {
 namespace detail {
@@ -12,7 +15,7 @@ TimeWindowQuantiles::TimeWindowQuantiles(
       last_rotation_(Clock::now()),
       rotation_interval_(max_age / age_buckets) {}
 
-double TimeWindowQuantiles::get(double q) {
+double TimeWindowQuantiles::get(double q) const {
   CKMSQuantiles& current_bucket = rotate();
   return current_bucket.get(q);
 }
@@ -24,7 +27,7 @@ void TimeWindowQuantiles::insert(double value) {
   }
 }
 
-CKMSQuantiles& TimeWindowQuantiles::rotate() {
+CKMSQuantiles& TimeWindowQuantiles::rotate() const {
   auto delta = Clock::now() - last_rotation_;
   while (delta > rotation_interval_) {
     ckms_quantiles_[current_bucket_].reset();
diff --git a/core/src/detail/utils.cc b/core/src/detail/utils.cc
new file mode 100644
index 00000000..bf67d8c2
--- /dev/null
+++ b/core/src/detail/utils.cc
@@ -0,0 +1,24 @@
+#include "prometheus/detail/utils.h"
+
+#include <cstddef>
+#include <map>
+#include <utility>
+
+#include "hash.h"
+
+namespace prometheus {
+
+namespace detail {
+
+std::size_t LabelHasher::operator()(const Labels& labels) const {
+  std::size_t seed = 0;
+  for (auto& label : labels) {
+    hash_combine(&seed, label.first, label.second);
+  }
+
+  return seed;
+}
+
+}  // namespace detail
+
+}  // namespace prometheus
diff --git a/core/src/family.cc b/core/src/family.cc
new file mode 100644
index 00000000..8827fa47
--- /dev/null
+++ b/core/src/family.cc
@@ -0,0 +1,130 @@
+#include "prometheus/family.h"
+
+#include <algorithm>
+#include <cassert>
+#include <map>
+#include <stdexcept>
+#include <utility>
+
+#include "prometheus/check_names.h"
+#include "prometheus/counter.h"
+#include "prometheus/gauge.h"
+#include "prometheus/histogram.h"
+#include "prometheus/info.h"
+#include "prometheus/summary.h"
+
+namespace prometheus {
+
+template <typename T>
+Family<T>::Family(const std::string& name, const std::string& help,
+                  const Labels& constant_labels)
+    : name_(name), help_(help), constant_labels_(constant_labels) {
+  if (!CheckMetricName(name_)) {
+    throw std::invalid_argument("Invalid metric name");
+  }
+  for (auto& label_pair : constant_labels_) {
+    auto& label_name = label_pair.first;
+    if (!CheckLabelName(label_name, T::metric_type)) {
+      throw std::invalid_argument("Invalid label name");
+    }
+  }
+}
+
+template <typename T>
+T& Family<T>::Add(const Labels& labels, std::unique_ptr<T> object) {
+  std::lock_guard<std::mutex> lock{mutex_};
+
+  auto insert_result =
+      metrics_.insert(std::make_pair(labels, std::move(object)));
+
+  if (insert_result.second) {
+    // insertion took place, retroactively check for unlikely issues
+    for (auto& label_pair : labels) {
+      const auto& label_name = label_pair.first;
+      if (!CheckLabelName(label_name, T::metric_type)) {
+        metrics_.erase(insert_result.first);
+        throw std::invalid_argument("Invalid label name");
+      }
+      if (constant_labels_.count(label_name)) {
+        metrics_.erase(insert_result.first);
+        throw std::invalid_argument("Duplicate label name");
+      }
+    }
+  }
+
+  auto& stored_object = insert_result.first->second;
+  assert(stored_object);
+  return *stored_object;
+}
+
+template <typename T>
+void Family<T>::Remove(T* metric) {
+  std::lock_guard<std::mutex> lock{mutex_};
+
+  for (auto it = metrics_.begin(); it != metrics_.end(); ++it) {
+    if (it->second.get() == metric) {
+      metrics_.erase(it);
+      break;
+    }
+  }
+}
+
+template <typename T>
+bool Family<T>::Has(const Labels& labels) const {
+  std::lock_guard<std::mutex> lock{mutex_};
+  return metrics_.count(labels) != 0u;
+}
+
+template <typename T>
+const std::string& Family<T>::GetName() const {
+  return name_;
+}
+
+template <typename T>
+const Labels& Family<T>::GetConstantLabels() const {
+  return constant_labels_;
+}
+
+template <typename T>
+std::vector<MetricFamily> Family<T>::Collect() const {
+  std::lock_guard<std::mutex> lock{mutex_};
+
+  if (metrics_.empty()) {
+    return {};
+  }
+
+  auto family = MetricFamily{};
+  family.name = name_;
+  family.help = help_;
+  family.type = T::metric_type;
+  family.metric.reserve(metrics_.size());
+  for (const auto& m : metrics_) {
+    family.metric.push_back(std::move(CollectMetric(m.first, m.second.get())));
+  }
+  return {family};
+}
+
+template <typename T>
+ClientMetric Family<T>::CollectMetric(const Labels& metric_labels,
+                                      T* metric) const {
+  auto collected = metric->Collect();
+  collected.label.reserve(constant_labels_.size() + metric_labels.size());
+  const auto add_label =
+      [&collected](const std::pair<std::string, std::string>& label_pair) {
+        auto label = ClientMetric::Label{};
+        label.name = label_pair.first;
+        label.value = label_pair.second;
+        collected.label.push_back(std::move(label));
+      };
+  std::for_each(constant_labels_.cbegin(), constant_labels_.cend(), add_label);
+  std::for_each(metric_labels.cbegin(), metric_labels.cend(), add_label);
+  return collected;
+}
+
+template class PROMETHEUS_CPP_CORE_EXPORT Family<Counter>;
+template class PROMETHEUS_CPP_CORE_EXPORT Family<Gauge>;
+template class PROMETHEUS_CPP_CORE_EXPORT Family<Histogram>;
+template class PROMETHEUS_CPP_CORE_EXPORT Family<Info>;
+template class PROMETHEUS_CPP_CORE_EXPORT Family<Summary>;
+
+}  // namespace prometheus
diff --git a/core/src/gauge.cc b/core/src/gauge.cc
index 129b6679..a52d103a 100644
--- a/core/src/gauge.cc
+++ b/core/src/gauge.cc
@@ -8,28 +8,25 @@ Gauge::Gauge(const double value) : value_{value} {}
 
 void Gauge::Increment() { Increment(1.0); }
 
-void Gauge::Increment(const double value) {
-  if (value < 0.0) {
-    return;
-  }
-  Change(value);
-}
+void Gauge::Increment(const double value) { Change(value); }
 
 void Gauge::Decrement() { Decrement(1.0); }
 
-void Gauge::Decrement(const double value) {
-  if (value < 0.0) {
-    return;
-  }
-  Change(-1.0 * value);
-}
+void Gauge::Decrement(const double value) { Change(-1.0 * value); }
 
 void Gauge::Set(const double value) { value_.store(value); }
 
 void Gauge::Change(const double value) {
+#if __cpp_lib_atomic_float >= 201711L
+  value_.fetch_add(value);
+#else
+  // Pre-C++ 20 fallback: busy loop (which might be more expansive than using
+  // fetch_add).
   auto current = value_.load();
-  while (!value_.compare_exchange_weak(current, current + value))
-    ;
+  while (!value_.compare_exchange_weak(current, current + value)) {
+    // intentionally empty block
+  }
+#endif
 }
 
 void Gauge::SetToCurrentTime() {
@@ -45,6 +42,4 @@ ClientMetric Gauge::Collect() const {
   return metric;
 }
 
-detail::GaugeBuilder BuildGauge() { return {}; }
-
 }  // namespace prometheus
diff --git a/core/src/histogram.cc b/core/src/histogram.cc
index dce8c0ac..e4377386 100644
--- a/core/src/histogram.cc
+++ b/core/src/histogram.cc
@@ -1,33 +1,84 @@
 #include "prometheus/histogram.h"
 
 #include <algorithm>
-#include <cassert>
+#include <cstddef>
+#include <functional>
 #include <iterator>
-#include <numeric>
+#include <limits>
+#include <memory>
+#include <stdexcept>
+#include <utility>
 
 namespace prometheus {
 
+namespace {
+
+template <class ForwardIterator>
+bool is_strict_sorted(ForwardIterator first, ForwardIterator last) {
+  return std::adjacent_find(first, last,
+                            std::greater_equal<typename std::iterator_traits<
+                                ForwardIterator>::value_type>()) == last;
+}
+
+}  // namespace
+
 Histogram::Histogram(const BucketBoundaries& buckets)
-    : bucket_boundaries_{buckets}, bucket_counts_{buckets.size() + 1}, sum_{} {
-  assert(std::is_sorted(std::begin(bucket_boundaries_),
-                        std::end(bucket_boundaries_)));
+    : bucket_boundaries_{buckets}, bucket_counts_{buckets.size() + 1} {
+  if (!is_strict_sorted(begin(bucket_boundaries_), end(bucket_boundaries_))) {
+    throw std::invalid_argument("Bucket Boundaries must be strictly sorted");
+  }
+}
+
+Histogram::Histogram(BucketBoundaries&& buckets)
+    : bucket_boundaries_{std::move(buckets)},
+      bucket_counts_{bucket_boundaries_.size() + 1} {
+  if (!is_strict_sorted(begin(bucket_boundaries_), end(bucket_boundaries_))) {
+    throw std::invalid_argument("Bucket Boundaries must be strictly sorted");
+  }
 }
 
 void Histogram::Observe(const double value) {
-  // TODO: determine bucket list size at which binary search would be faster
-  const auto bucket_index = static_cast<std::size_t>(std::distance(
-      bucket_boundaries_.begin(),
-      std::find_if(
-          std::begin(bucket_boundaries_), std::end(bucket_boundaries_),
-          [value](const double boundary) { return boundary >= value; })));
+  const auto bucket_index = static_cast<std::size_t>(
+      std::distance(bucket_boundaries_.begin(),
+                    std::lower_bound(bucket_boundaries_.begin(),
+                                     bucket_boundaries_.end(), value)));
+
+  std::lock_guard<std::mutex> lock(mutex_);
   sum_.Increment(value);
   bucket_counts_[bucket_index].Increment();
 }
 
+void Histogram::ObserveMultiple(const std::vector<double>& bucket_increments,
+                                const double sum_of_values) {
+  if (bucket_increments.size() != bucket_counts_.size()) {
+    throw std::length_error(
+        "The size of bucket_increments was not equal to"
+        "the number of buckets in the histogram.");
+  }
+
+  std::lock_guard<std::mutex> lock(mutex_);
+  sum_.Increment(sum_of_values);
+
+  for (std::size_t i{0}; i < bucket_counts_.size(); ++i) {
+    bucket_counts_[i].Increment(bucket_increments[i]);
+  }
+}
+
+void Histogram::Reset() {
+  std::lock_guard<std::mutex> lock(mutex_);
+  for (std::size_t i = 0; i < bucket_counts_.size(); ++i) {
+    bucket_counts_[i].Reset();
+  }
+  sum_.Set(0);
+}
+
 ClientMetric Histogram::Collect() const {
+  std::lock_guard<std::mutex> lock(mutex_);
+
   auto metric = ClientMetric{};
 
   auto cumulative_count = 0ULL;
+  metric.histogram.bucket.reserve(bucket_counts_.size());
   for (std::size_t i{0}; i < bucket_counts_.size(); ++i) {
     cumulative_count += bucket_counts_[i].Value();
     auto bucket = ClientMetric::Bucket{};
@@ -43,6 +94,4 @@ ClientMetric Histogram::Collect() const {
   return metric;
 }
 
-detail::HistogramBuilder BuildHistogram() { return {}; }
-
 }  // namespace prometheus
diff --git a/core/src/info.cc b/core/src/info.cc
new file mode 100644
index 00000000..ea430382
--- /dev/null
+++ b/core/src/info.cc
@@ -0,0 +1,11 @@
+#include "prometheus/info.h"
+
+namespace prometheus {
+
+ClientMetric Info::Collect() const {
+  ClientMetric metric;
+  metric.info.value = 1;
+  return metric;
+}
+
+}  // namespace prometheus
diff --git a/core/src/registry.cc b/core/src/registry.cc
index ab19cfa6..9e58b0bc 100644
--- a/core/src/registry.cc
+++ b/core/src/registry.cc
@@ -1,16 +1,197 @@
 #include "prometheus/registry.h"
 
+#include <algorithm>
+#include <iterator>
+#include <stdexcept>
+#include <tuple>
+
+#include "prometheus/counter.h"
+#include "prometheus/detail/future_std.h"
+#include "prometheus/gauge.h"
+#include "prometheus/histogram.h"
+#include "prometheus/info.h"
+#include "prometheus/summary.h"
+
 namespace prometheus {
 
-std::vector<MetricFamily> Registry::Collect() {
-  std::lock_guard<std::mutex> lock{mutex_};
-  auto results = std::vector<MetricFamily>{};
-  for (auto&& collectable : collectables_) {
+namespace {
+template <typename T>
+void CollectAll(std::vector<MetricFamily>& results, const T& families) {
+  for (auto&& collectable : families) {
     auto metrics = collectable->Collect();
-    results.insert(results.end(), metrics.begin(), metrics.end());
+    results.insert(results.end(), std::make_move_iterator(metrics.begin()),
+                   std::make_move_iterator(metrics.end()));
   }
+}
+
+bool FamilyNameExists(const std::string& /* name */) { return false; }
+
+template <typename T, typename... Args>
+bool FamilyNameExists(const std::string& name, const T& families,
+                      Args&&... args) {
+  auto sameName = [&name](const typename T::value_type& entry) {
+    return name == entry->GetName();
+  };
+  auto exists = std::find_if(std::begin(families), std::end(families),
+                             sameName) != std::end(families);
+  return exists || FamilyNameExists(name, args...);
+}
+}  // namespace
+
+Registry::Registry(InsertBehavior insert_behavior)
+    : insert_behavior_{insert_behavior} {}
+
+Registry::~Registry() = default;
+
+std::vector<MetricFamily> Registry::Collect() const {
+  std::lock_guard<std::mutex> lock{mutex_};
+  auto results = std::vector<MetricFamily>{};
+
+  CollectAll(results, counters_);
+  CollectAll(results, gauges_);
+  CollectAll(results, histograms_);
+  CollectAll(results, infos_);
+  CollectAll(results, summaries_);
 
   return results;
 }
 
+template <>
+std::vector<std::unique_ptr<Family<Counter>>>& Registry::GetFamilies() {
+  return counters_;
+}
+
+template <>
+std::vector<std::unique_ptr<Family<Gauge>>>& Registry::GetFamilies() {
+  return gauges_;
+}
+
+template <>
+std::vector<std::unique_ptr<Family<Histogram>>>& Registry::GetFamilies() {
+  return histograms_;
+}
+
+template <>
+std::vector<std::unique_ptr<Family<Info>>>& Registry::GetFamilies() {
+  return infos_;
+}
+
+template <>
+std::vector<std::unique_ptr<Family<Summary>>>& Registry::GetFamilies() {
+  return summaries_;
+}
+
+template <>
+bool Registry::NameExistsInOtherType<Counter>(const std::string& name) const {
+  return FamilyNameExists(name, gauges_, histograms_, infos_, summaries_);
+}
+
+template <>
+bool Registry::NameExistsInOtherType<Gauge>(const std::string& name) const {
+  return FamilyNameExists(name, counters_, histograms_, infos_, summaries_);
+}
+
+template <>
+bool Registry::NameExistsInOtherType<Histogram>(const std::string& name) const {
+  return FamilyNameExists(name, counters_, gauges_, infos_, summaries_);
+}
+
+template <>
+bool Registry::NameExistsInOtherType<Info>(const std::string& name) const {
+  return FamilyNameExists(name, counters_, gauges_, histograms_, summaries_);
+}
+
+template <>
+bool Registry::NameExistsInOtherType<Summary>(const std::string& name) const {
+  return FamilyNameExists(name, counters_, gauges_, histograms_, infos_);
+}
+
+template <typename T>
+Family<T>& Registry::Add(const std::string& name, const std::string& help,
+                         const Labels& labels) {
+  std::lock_guard<std::mutex> lock{mutex_};
+
+  if (NameExistsInOtherType<T>(name)) {
+    throw std::invalid_argument(
+        "Family name already exists with different type");
+  }
+
+  auto& families = GetFamilies<T>();
+
+  auto same_name = [&name](const std::unique_ptr<Family<T>>& family) {
+    return name == family->GetName();
+  };
+
+  auto it = std::find_if(families.begin(), families.end(), same_name);
+  if (it != families.end()) {
+    if (insert_behavior_ == InsertBehavior::Merge) {
+      if ((*it)->GetConstantLabels() == labels) {
+        return **it;
+      }
+      throw std::invalid_argument(
+          "Family name already exists with different constant labels");
+    } else {
+      throw std::invalid_argument("Family name already exists");
+    }
+  }
+
+  auto family = detail::make_unique<Family<T>>(name, help, labels);
+  auto& ref = *family;
+  families.push_back(std::move(family));
+  return ref;
+}
+
+template Family<Counter>& Registry::Add(const std::string& name,
+                                        const std::string& help,
+                                        const Labels& labels);
+
+template Family<Gauge>& Registry::Add(const std::string& name,
+                                      const std::string& help,
+                                      const Labels& labels);
+
+template Family<Info>& Registry::Add(const std::string& name,
+                                     const std::string& help,
+                                     const Labels& labels);
+
+template Family<Summary>& Registry::Add(const std::string& name,
+                                        const std::string& help,
+                                        const Labels& labels);
+
+template Family<Histogram>& Registry::Add(const std::string& name,
+                                          const std::string& help,
+                                          const Labels& labels);
+
+template <typename T>
+bool Registry::Remove(const Family<T>& family) {
+  std::lock_guard<std::mutex> lock{mutex_};
+
+  auto& families = GetFamilies<T>();
+  auto same_family = [&family](const std::unique_ptr<Family<T>>& in) {
+    return &family == in.get();
+  };
+
+  auto it = std::find_if(families.begin(), families.end(), same_family);
+  if (it == families.end()) {
+    return false;
+  }
+
+  families.erase(it);
+  return true;
+}
+
+template bool PROMETHEUS_CPP_CORE_EXPORT
+Registry::Remove(const Family<Counter>& family);
+
+template bool PROMETHEUS_CPP_CORE_EXPORT
+Registry::Remove(const Family<Gauge>& family);
+
+template bool PROMETHEUS_CPP_CORE_EXPORT
+Registry::Remove(const Family<Summary>& family);
+
+template bool PROMETHEUS_CPP_CORE_EXPORT
+Registry::Remove(const Family<Histogram>& family);
+
+template bool PROMETHEUS_CPP_CORE_EXPORT
+Registry::Remove(const Family<Info>& family);
+
 }  // namespace prometheus
diff --git a/core/src/serializer.cc b/core/src/serializer.cc
index 350692f4..8b14dc77 100644
--- a/core/src/serializer.cc
+++ b/core/src/serializer.cc
@@ -1,13 +1,13 @@
 #include "prometheus/serializer.h"
 
-#include <sstream>
+#include <sstream>  // IWYU pragma: keep
 
 namespace prometheus {
 
 std::string Serializer::Serialize(
-    const std::vector<MetricFamily> &metrics) const {
+    const std::vector<MetricFamily>& metrics) const {
   std::ostringstream ss;
   Serialize(ss, metrics);
   return ss.str();
 }
-}
+}  // namespace prometheus
diff --git a/core/src/summary.cc b/core/src/summary.cc
index c81db508..29902140 100644
--- a/core/src/summary.cc
+++ b/core/src/summary.cc
@@ -1,12 +1,17 @@
 #include "prometheus/summary.h"
 
+#include <utility>
+
 namespace prometheus {
 
 Summary::Summary(const Quantiles& quantiles,
                  const std::chrono::milliseconds max_age, const int age_buckets)
     : quantiles_{quantiles},
-      count_{0},
-      sum_{0},
+      quantile_values_{quantiles_, max_age, age_buckets} {}
+
+Summary::Summary(Quantiles&& quantiles, const std::chrono::milliseconds max_age,
+                 const int age_buckets)
+    : quantiles_{std::move(quantiles)},
       quantile_values_{quantiles_, max_age, age_buckets} {}
 
 void Summary::Observe(const double value) {
@@ -17,11 +22,12 @@ void Summary::Observe(const double value) {
   quantile_values_.insert(value);
 }
 
-ClientMetric Summary::Collect() {
+ClientMetric Summary::Collect() const {
   auto metric = ClientMetric{};
 
   std::lock_guard<std::mutex> lock(mutex_);
 
+  metric.summary.quantile.reserve(quantiles_.size());
   for (const auto& quantile : quantiles_) {
     auto metricQuantile = ClientMetric::Quantile{};
     metricQuantile.quantile = quantile.quantile;
@@ -34,6 +40,4 @@ ClientMetric Summary::Collect() {
   return metric;
 }
 
-detail::SummaryBuilder BuildSummary() { return {}; }
-
 }  // namespace prometheus
diff --git a/core/src/text_serializer.cc b/core/src/text_serializer.cc
index 5063484a..0656b505 100644
--- a/core/src/text_serializer.cc
+++ b/core/src/text_serializer.cc
@@ -2,65 +2,72 @@
 
 #include <cmath>
 #include <limits>
+#include <locale>
+#include <ostream>
+#include <string>
+
+#include "prometheus/client_metric.h"
+#include "prometheus/metric_family.h"
+#include "prometheus/metric_type.h"
 
 namespace prometheus {
 
 namespace {
 
 // Write a double as a string, with proper formatting for infinity and NaN
-std::string ToString(double v) {
-  if (std::isnan(v)) {
-    return "Nan";
-  }
-  if (std::isinf(v)) {
-    return (v < 0 ? "-Inf" : "+Inf");
+void WriteValue(std::ostream& out, double value) {
+  if (std::isnan(value)) {
+    out << "Nan";
+  } else if (std::isinf(value)) {
+    out << (value < 0 ? "-Inf" : "+Inf");
+  } else {
+    out << value;
   }
-  return std::to_string(v);
 }
 
-const std::string& EscapeLabelValue(const std::string& value,
-                                    std::string* tmp) {
-  bool copy = false;
-  for (size_t i = 0; i < value.size(); ++i) {
-    auto c = value[i];
-    if (c == '\\' || c == '"' || c == '\n') {
-      if (!copy) {
-        tmp->reserve(value.size() + 1);
-        tmp->assign(value, 0, i);
-        copy = true;
-      }
-      if (c == '\\') {
-        tmp->append("\\\\");
-      } else if (c == '"') {
-        tmp->append("\\\"");
-      } else {
-        tmp->append("\\\n");
-      }
-    } else if (copy) {
-      tmp->push_back(c);
+void WriteValue(std::ostream& out, const std::string& value) {
+  for (auto c : value) {
+    switch (c) {
+      case '\n':
+        out << '\\' << 'n';
+        break;
+
+      case '\\':
+        out << '\\' << c;
+        break;
+
+      case '"':
+        out << '\\' << c;
+        break;
+
+      default:
+        out << c;
+        break;
     }
   }
-  return copy ? *tmp : value;
 }
 
 // Write a line header: metric name and labels
+template <typename T = std::string>
 void WriteHead(std::ostream& out, const MetricFamily& family,
                const ClientMetric& metric, const std::string& suffix = "",
                const std::string& extraLabelName = "",
-               const std::string& extraLabelValue = "") {
+               const T& extraLabelValue = T()) {
   out << family.name << suffix;
   if (!metric.label.empty() || !extraLabelName.empty()) {
     out << "{";
     const char* prefix = "";
-    std::string tmp;
+
     for (auto& lp : metric.label) {
-      out << prefix << lp.name << "=\"" << EscapeLabelValue(lp.value, &tmp)
-          << "\"";
+      out << prefix << lp.name << "=\"";
+      WriteValue(out, lp.value);
+      out << "\"";
       prefix = ",";
     }
     if (!extraLabelName.empty()) {
-      out << prefix << extraLabelName << "=\""
-          << EscapeLabelValue(extraLabelValue, &tmp) << "\"";
+      out << prefix << extraLabelName << "=\"";
+      WriteValue(out, extraLabelValue);
+      out << "\"";
     }
     out << "}";
   }
@@ -78,14 +85,21 @@ void WriteTail(std::ostream& out, const ClientMetric& metric) {
 void SerializeCounter(std::ostream& out, const MetricFamily& family,
                       const ClientMetric& metric) {
   WriteHead(out, family, metric);
-  out << ToString(metric.counter.value);
+  WriteValue(out, metric.counter.value);
   WriteTail(out, metric);
 }
 
 void SerializeGauge(std::ostream& out, const MetricFamily& family,
                     const ClientMetric& metric) {
   WriteHead(out, family, metric);
-  out << ToString(metric.gauge.value);
+  WriteValue(out, metric.gauge.value);
+  WriteTail(out, metric);
+}
+
+void SerializeInfo(std::ostream& out, const MetricFamily& family,
+                   const ClientMetric& metric) {
+  WriteHead(out, family, metric, "_info");
+  WriteValue(out, metric.info.value);
   WriteTail(out, metric);
 }
 
@@ -97,12 +111,12 @@ void SerializeSummary(std::ostream& out, const MetricFamily& family,
   WriteTail(out, metric);
 
   WriteHead(out, family, metric, "_sum");
-  out << ToString(sum.sample_sum);
+  WriteValue(out, sum.sample_sum);
   WriteTail(out, metric);
 
   for (auto& q : sum.quantile) {
-    WriteHead(out, family, metric, "", "quantile", ToString(q.quantile));
-    out << ToString(q.value);
+    WriteHead(out, family, metric, "", "quantile", q.quantile);
+    WriteValue(out, q.value);
     WriteTail(out, metric);
   }
 }
@@ -110,7 +124,7 @@ void SerializeSummary(std::ostream& out, const MetricFamily& family,
 void SerializeUntyped(std::ostream& out, const MetricFamily& family,
                       const ClientMetric& metric) {
   WriteHead(out, family, metric);
-  out << ToString(metric.untyped.value);
+  WriteValue(out, metric.untyped.value);
   WriteTail(out, metric);
 }
 
@@ -122,12 +136,12 @@ void SerializeHistogram(std::ostream& out, const MetricFamily& family,
   WriteTail(out, metric);
 
   WriteHead(out, family, metric, "_sum");
-  out << ToString(hist.sample_sum);
+  WriteValue(out, hist.sample_sum);
   WriteTail(out, metric);
 
   double last = -std::numeric_limits<double>::infinity();
   for (auto& b : hist.bucket) {
-    WriteHead(out, family, metric, "_bucket", "le", ToString(b.upper_bound));
+    WriteHead(out, family, metric, "_bucket", "le", b.upper_bound);
     last = b.upper_bound;
     out << b.cumulative_count;
     WriteTail(out, metric);
@@ -157,6 +171,14 @@ void SerializeFamily(std::ostream& out, const MetricFamily& family) {
         SerializeGauge(out, family, metric);
       }
       break;
+    // info is not handled by prometheus, we use gauge as workaround
+    // (https://github.com/OpenObservability/OpenMetrics/blob/98ae26c87b1c3bcf937909a880b32c8be643cc9b/specification/OpenMetrics.md#info-1)
+    case MetricType::Info:
+      out << "# TYPE " << family.name << " gauge\n";
+      for (auto& metric : family.metric) {
+        SerializeInfo(out, family, metric);
+      }
+      break;
     case MetricType::Summary:
       out << "# TYPE " << family.name << " summary\n";
       for (auto& metric : family.metric) {
@@ -175,16 +197,23 @@ void SerializeFamily(std::ostream& out, const MetricFamily& family) {
         SerializeHistogram(out, family, metric);
       }
       break;
-    default:
-      break;
   }
 }
 }  // namespace
 
 void TextSerializer::Serialize(std::ostream& out,
                                const std::vector<MetricFamily>& metrics) const {
+  auto saved_locale = out.getloc();
+  auto saved_precision = out.precision();
+
+  out.imbue(std::locale::classic());
+  out.precision(std::numeric_limits<double>::max_digits10 - 1);
+
   for (auto& family : metrics) {
     SerializeFamily(out, family);
   }
+
+  out.imbue(saved_locale);
+  out.precision(saved_precision);
 }
 }  // namespace prometheus
diff --git a/core/tests/BUILD.bazel b/core/tests/BUILD.bazel
index f82aa5ae..74636d82 100644
--- a/core/tests/BUILD.bazel
+++ b/core/tests/BUILD.bazel
@@ -5,9 +5,9 @@ cc_test(
         "*.h",
     ]),
     copts = ["-Iexternal/googletest/include"],
-    linkstatic = 1,
+    linkstatic = True,
     deps = [
         "//core",
-        "@com_google_googletest//:gtest_main",
+        "@googletest//:gtest_main",
     ],
 )
diff --git a/core/tests/CMakeLists.txt b/core/tests/CMakeLists.txt
index 274f54d8..7aa90d55 100644
--- a/core/tests/CMakeLists.txt
+++ b/core/tests/CMakeLists.txt
@@ -1,21 +1,26 @@
 
-add_executable(prometheus_test
-  check_names_test.cc
+add_executable(prometheus_core_test
+  builder_test.cc
+  check_label_name_test.cc
+  check_metric_name_test.cc
   counter_test.cc
   family_test.cc
   gauge_test.cc
   histogram_test.cc
   registry_test.cc
+  serializer_test.cc
   summary_test.cc
+  text_serializer_test.cc
+  utils_test.cc
 )
 
-target_link_libraries(prometheus_test
+target_link_libraries(prometheus_core_test
   PRIVATE
     ${PROJECT_NAME}::core
     GTest::gmock_main
 )
 
 add_test(
-  NAME prometheus_test
-  COMMAND prometheus_test
+  NAME prometheus_core_test
+  COMMAND prometheus_core_test
 )
diff --git a/core/tests/builder_test.cc b/core/tests/builder_test.cc
new file mode 100644
index 00000000..6fdffafa
--- /dev/null
+++ b/core/tests/builder_test.cc
@@ -0,0 +1,116 @@
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <algorithm>
+#include <iterator>
+#include <map>
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "prometheus/client_metric.h"
+#include "prometheus/counter.h"
+#include "prometheus/family.h"
+#include "prometheus/gauge.h"
+#include "prometheus/histogram.h"
+#include "prometheus/info.h"
+#include "prometheus/labels.h"
+#include "prometheus/registry.h"
+#include "prometheus/summary.h"
+
+namespace prometheus {
+namespace {
+
+class BuilderTest : public testing::Test {
+ protected:
+  std::vector<ClientMetric::Label> getExpectedLabels() {
+    std::vector<ClientMetric::Label> labels;
+
+    auto gen = [](const std::pair<const std::string, std::string>& p) {
+      return ClientMetric::Label{p.first, p.second};
+    };
+
+    std::transform(std::begin(const_labels), std::end(const_labels),
+                   std::back_inserter(labels), gen);
+    std::transform(std::begin(more_labels), std::end(more_labels),
+                   std::back_inserter(labels), gen);
+
+    return labels;
+  }
+
+  void verifyCollectedLabels() {
+    const auto collected = registry.Collect();
+
+    ASSERT_EQ(1U, collected.size());
+    EXPECT_EQ(name, collected.at(0).name);
+    EXPECT_EQ(help, collected.at(0).help);
+    ASSERT_EQ(1U, collected.at(0).metric.size());
+
+    EXPECT_THAT(collected.at(0).metric.at(0).label,
+                testing::UnorderedElementsAreArray(expected_labels));
+  }
+
+  Registry registry;
+
+  const std::string name = "some_name";
+  const std::string help = "Additional description.";
+  const Labels const_labels = {{"key", "value"}};
+  const Labels more_labels = {{"name", "test"}};
+  const std::vector<ClientMetric::Label> expected_labels = getExpectedLabels();
+};
+
+TEST_F(BuilderTest, build_counter) {
+  auto& family = BuildCounter()
+                     .Name(name)
+                     .Help(help)
+                     .Labels(const_labels)
+                     .Register(registry);
+  family.Add(more_labels);
+
+  verifyCollectedLabels();
+}
+
+TEST_F(BuilderTest, build_gauge) {
+  auto& family = BuildGauge()
+                     .Name(name)
+                     .Help(help)
+                     .Labels(const_labels)
+                     .Register(registry);
+  family.Add(more_labels);
+
+  verifyCollectedLabels();
+}
+
+TEST_F(BuilderTest, build_histogram) {
+  auto& family = BuildHistogram()
+                     .Name(name)
+                     .Help(help)
+                     .Labels(const_labels)
+                     .Register(registry);
+  family.Add(more_labels, Histogram::BucketBoundaries{1, 2});
+
+  verifyCollectedLabels();
+}
+
+TEST_F(BuilderTest, build_info) {
+  auto& family =
+      BuildInfo().Name(name).Help(help).Labels(const_labels).Register(registry);
+  family.Add(more_labels);
+
+  verifyCollectedLabels();
+}
+
+TEST_F(BuilderTest, build_summary) {
+  auto& family = BuildSummary()
+                     .Name(name)
+                     .Help(help)
+                     .Labels(const_labels)
+                     .Register(registry);
+  family.Add(more_labels, Summary::Quantiles{});
+
+  verifyCollectedLabels();
+}
+
+}  // namespace
+}  // namespace prometheus
diff --git a/core/tests/check_label_name_test.cc b/core/tests/check_label_name_test.cc
new file mode 100644
index 00000000..9fc900a5
--- /dev/null
+++ b/core/tests/check_label_name_test.cc
@@ -0,0 +1,53 @@
+#include <gtest/gtest.h>
+
+#include <string>
+
+#include "prometheus/check_names.h"
+#include "prometheus/metric_type.h"
+
+namespace prometheus {
+namespace {
+
+class CheckLabelNameTest : public testing::TestWithParam<MetricType> {
+ protected:
+  bool CheckLabelName(const std::string& name) {
+    return ::prometheus::CheckLabelName(name, GetParam());
+  }
+};
+
+TEST_P(CheckLabelNameTest, empty_label_name) {
+  EXPECT_FALSE(CheckLabelName(""));
+}
+TEST_P(CheckLabelNameTest, invalid_label_name) {
+  EXPECT_FALSE(CheckLabelName("log-level"));
+}
+TEST_P(CheckLabelNameTest, leading_invalid_label_name) {
+  EXPECT_FALSE(CheckLabelName("-abcd"));
+}
+TEST_P(CheckLabelNameTest, trailing_invalid_label_name) {
+  EXPECT_FALSE(CheckLabelName("abcd-"));
+}
+TEST_P(CheckLabelNameTest, good_label_name) {
+  EXPECT_TRUE(CheckLabelName("type"));
+}
+TEST_P(CheckLabelNameTest, numeric_label_name) {
+  EXPECT_FALSE(CheckLabelName("2unlimited"));
+}
+TEST_P(CheckLabelNameTest, reserved_label_name) {
+  EXPECT_FALSE(CheckLabelName("__some_reserved_label"));
+}
+TEST_P(CheckLabelNameTest, reject_le_for_histogram) {
+  EXPECT_EQ(GetParam() != MetricType::Histogram, CheckLabelName("le"));
+}
+TEST_P(CheckLabelNameTest, reject_quantile_for_histogram) {
+  EXPECT_EQ(GetParam() != MetricType::Summary, CheckLabelName("quantile"));
+}
+
+INSTANTIATE_TEST_SUITE_P(AllMetricTypes, CheckLabelNameTest,
+                         testing::Values(MetricType::Counter, MetricType::Gauge,
+                                         MetricType::Histogram,
+                                         MetricType::Info, MetricType::Summary,
+                                         MetricType::Untyped));
+
+}  // namespace
+}  // namespace prometheus
diff --git a/core/tests/check_metric_name_test.cc b/core/tests/check_metric_name_test.cc
new file mode 100644
index 00000000..ed32d1f3
--- /dev/null
+++ b/core/tests/check_metric_name_test.cc
@@ -0,0 +1,25 @@
+#include <gtest/gtest.h>
+
+#include "prometheus/check_names.h"
+
+namespace prometheus {
+namespace {
+
+TEST(CheckMetricNameTest, empty_metric_name) {
+  EXPECT_FALSE(CheckMetricName(""));
+}
+TEST(CheckMetricNameTest, good_metric_name) {
+  EXPECT_TRUE(CheckMetricName("prometheus_notifications_total"));
+}
+TEST(CheckMetricNameTest, numeric_metric_name) {
+  EXPECT_FALSE(CheckMetricName("2unlimited"));
+}
+TEST(CheckMetricNameTest, reserved_metric_name) {
+  EXPECT_FALSE(CheckMetricName("__some_reserved_metric"));
+}
+TEST(CheckMetricNameTest, malformed_metric_name) {
+  EXPECT_FALSE(CheckMetricName("fa mi ly with space in name or |"));
+}
+
+}  // namespace
+}  // namespace prometheus
diff --git a/core/tests/check_names_test.cc b/core/tests/check_names_test.cc
deleted file mode 100644
index 8d694507..00000000
--- a/core/tests/check_names_test.cc
+++ /dev/null
@@ -1,23 +0,0 @@
-#include "prometheus/check_names.h"
-
-#include <gmock/gmock.h>
-
-namespace prometheus {
-namespace {
-
-TEST(CheckNamesTest, empty_metric_name) { EXPECT_FALSE(CheckMetricName("")); }
-TEST(CheckNamesTest, good_metric_name) {
-  EXPECT_TRUE(CheckMetricName("prometheus_notifications_total"));
-}
-TEST(CheckNamesTest, reserved_metric_name) {
-  EXPECT_FALSE(CheckMetricName("__some_reserved_metric"));
-}
-
-TEST(CheckNamesTest, empty_label_name) { EXPECT_FALSE(CheckLabelName("")); }
-TEST(CheckNamesTest, good_label_name) { EXPECT_TRUE(CheckLabelName("type")); }
-TEST(CheckNamesTest, reserved_label_name) {
-  EXPECT_FALSE(CheckMetricName("__some_reserved_label"));
-}
-
-}  // namespace
-}  // namespace prometheus
diff --git a/core/tests/counter_test.cc b/core/tests/counter_test.cc
index 1c5566cb..09384fc8 100644
--- a/core/tests/counter_test.cc
+++ b/core/tests/counter_test.cc
@@ -1,6 +1,6 @@
 #include "prometheus/counter.h"
 
-#include <gmock/gmock.h>
+#include <gtest/gtest.h>
 
 namespace prometheus {
 namespace {
@@ -37,5 +37,15 @@ TEST(CounterTest, inc_negative_value) {
   EXPECT_EQ(counter.Value(), 5.0);
 }
 
+TEST(CounterTest, reset) {
+  Counter counter;
+  counter.Increment();
+  counter.Reset();
+  EXPECT_EQ(counter.Value(), 0.0);
+  counter.Increment(5);
+  counter.Increment();
+  EXPECT_EQ(counter.Value(), 6.0);
+}
+
 }  // namespace
 }  // namespace prometheus
diff --git a/core/tests/family_test.cc b/core/tests/family_test.cc
index f26b16e1..a263d4df 100644
--- a/core/tests/family_test.cc
+++ b/core/tests/family_test.cc
@@ -1,12 +1,16 @@
 #include "prometheus/family.h"
 
-#include <memory>
-
 #include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <memory>
 
 #include "prometheus/client_metric.h"
+#include "prometheus/counter.h"
 #include "prometheus/detail/future_std.h"
 #include "prometheus/histogram.h"
+#include "prometheus/labels.h"
+#include "prometheus/summary.h"
 
 namespace prometheus {
 namespace {
@@ -20,19 +24,26 @@ TEST(FamilyTest, labels) {
                          {{const_label.name, const_label.value}}};
   family.Add({{dynamic_label.name, dynamic_label.value}});
   auto collected = family.Collect();
-  ASSERT_GE(collected.size(), 1);
-  ASSERT_GE(collected.at(0).metric.size(), 1);
+  ASSERT_GE(collected.size(), 1U);
+  ASSERT_GE(collected.at(0).metric.size(), 1U);
   EXPECT_THAT(collected.at(0).metric.at(0).label,
               ::testing::ElementsAre(const_label, dynamic_label));
 }
 
+TEST(FamilyTest, reject_same_label_keys) {
+  auto labels = Labels{{"component", "test"}};
+
+  Family<Counter> family{"total_requests", "Counts all requests", labels};
+  EXPECT_ANY_THROW(family.Add(labels));
+}
+
 TEST(FamilyTest, counter_value) {
   Family<Counter> family{"total_requests", "Counts all requests", {}};
   auto& counter = family.Add({});
   counter.Increment();
   auto collected = family.Collect();
-  ASSERT_GE(collected.size(), 1);
-  ASSERT_GE(collected[0].metric.size(), 1);
+  ASSERT_GE(collected.size(), 1U);
+  ASSERT_GE(collected[0].metric.size(), 1U);
   EXPECT_EQ(1, collected[0].metric.at(0).counter.value);
 }
 
@@ -42,8 +53,13 @@ TEST(FamilyTest, remove) {
   family.Add({{"name", "counter2"}});
   family.Remove(&counter1);
   auto collected = family.Collect();
-  ASSERT_GE(collected.size(), 1);
-  EXPECT_EQ(collected[0].metric.size(), 1);
+  ASSERT_GE(collected.size(), 1U);
+  EXPECT_EQ(collected[0].metric.size(), 1U);
+}
+
+TEST(FamilyTest, removeUnknownMetricMustNotCrash) {
+  Family<Counter> family{"total_requests", "Counts all requests", {}};
+  family.Remove(nullptr);
 }
 
 TEST(FamilyTest, Histogram) {
@@ -52,9 +68,9 @@ TEST(FamilyTest, Histogram) {
                                 Histogram::BucketBoundaries{0, 1, 2});
   histogram1.Observe(0);
   auto collected = family.Collect();
-  ASSERT_EQ(collected.size(), 1);
-  ASSERT_GE(collected[0].metric.size(), 1);
-  EXPECT_EQ(1, collected[0].metric.at(0).histogram.sample_count);
+  ASSERT_EQ(collected.size(), 1U);
+  ASSERT_GE(collected[0].metric.size(), 1U);
+  EXPECT_EQ(1U, collected[0].metric.at(0).histogram.sample_count);
 }
 
 TEST(FamilyTest, add_twice) {
@@ -64,22 +80,66 @@ TEST(FamilyTest, add_twice) {
   ASSERT_EQ(&counter, &counter1);
 }
 
-TEST(FamilyTest, should_assert_on_invalid_metric_name) {
+TEST(FamilyTest, throw_on_invalid_metric_name) {
   auto create_family_with_invalid_name = []() {
+    return detail::make_unique<Family<Counter>>("", "empty name", Labels{});
+  };
+  EXPECT_ANY_THROW(create_family_with_invalid_name());
+}
+
+TEST(FamilyTest, throw_on_invalid_constant_label_name) {
+  auto create_family_with_invalid_labels = []() {
     return detail::make_unique<Family<Counter>>(
-        "", "empty name", std::map<std::string, std::string>{});
+        "total_requests", "Counts all requests",
+        Labels{{"__inavlid", "counter1"}});
   };
-  EXPECT_DEBUG_DEATH(create_family_with_invalid_name(),
-                     ".*Assertion .*CheckMetricName.*");
+  EXPECT_ANY_THROW(create_family_with_invalid_labels());
 }
 
-TEST(FamilyTest, should_assert_on_invalid_labels) {
+TEST(FamilyTest, should_throw_on_invalid_labels) {
   Family<Counter> family{"total_requests", "Counts all requests", {}};
   auto add_metric_with_invalid_label_name = [&family]() {
     family.Add({{"__invalid", "counter1"}});
   };
-  EXPECT_DEBUG_DEATH(add_metric_with_invalid_label_name(),
-                     ".*Assertion .*CheckLabelName.*");
+  EXPECT_ANY_THROW(add_metric_with_invalid_label_name());
+}
+
+TEST(FamilyTest, should_not_collect_empty_metrics) {
+  Family<Counter> family{"total_requests", "Counts all requests", {}};
+  auto collected = family.Collect();
+  EXPECT_TRUE(collected.empty());
+}
+
+TEST(FamilyTest, query_family_if_metric_already_exists) {
+  Family<Counter> family{"total_requests", "Counts all requests", {}};
+  family.Add({{"name", "counter1"}});
+  EXPECT_TRUE(family.Has({{"name", "counter1"}}));
+  EXPECT_FALSE(family.Has({{"name", "counter2"}}));
+}
+
+TEST(FamilyTest, reject_histogram_with_constant_le_label) {
+  auto labels = Labels{{"le", "test"}};
+  EXPECT_ANY_THROW(
+      detail::make_unique<Family<Histogram>>("name", "help", labels));
+}
+
+TEST(FamilyTest, reject_histogram_with_le_label) {
+  Family<Histogram> family{"name", "help", {}};
+  auto labels = Labels{{"le", "test"}};
+  EXPECT_ANY_THROW(family.Add(labels, Histogram::BucketBoundaries{0, 1, 2}));
+}
+
+TEST(FamilyTest, reject_summary_with_constant_quantile_label) {
+  auto labels = Labels{{"quantile", "test"}};
+  EXPECT_ANY_THROW(
+      detail::make_unique<Family<Summary>>("name", "help", labels));
+}
+
+TEST(FamilyTest, reject_summary_with_quantile_label) {
+  Family<Summary> family{"name", "help", {}};
+  auto labels = Labels{{"quantile", "test"}};
+  auto quantiles = Summary::Quantiles{{0.5, 0.05}};
+  EXPECT_ANY_THROW(family.Add(labels, quantiles));
 }
 
 }  // namespace
diff --git a/core/tests/gauge_test.cc b/core/tests/gauge_test.cc
index fdcd34bf..690754b0 100644
--- a/core/tests/gauge_test.cc
+++ b/core/tests/gauge_test.cc
@@ -1,6 +1,6 @@
 #include "prometheus/gauge.h"
 
-#include <gmock/gmock.h>
+#include <gtest/gtest.h>
 
 namespace prometheus {
 namespace {
@@ -30,6 +30,12 @@ TEST(GaugeTest, inc_multiple) {
   EXPECT_EQ(gauge.Value(), 7.0);
 }
 
+TEST(GaugeTest, inc_negative_value) {
+  Gauge gauge;
+  gauge.Increment(-1.0);
+  EXPECT_EQ(gauge.Value(), -1.0);
+}
+
 TEST(GaugeTest, dec) {
   Gauge gauge;
   gauge.Set(5.0);
@@ -37,6 +43,12 @@ TEST(GaugeTest, dec) {
   EXPECT_EQ(gauge.Value(), 4.0);
 }
 
+TEST(GaugeTest, dec_negative_value) {
+  Gauge gauge;
+  gauge.Decrement(-1.0);
+  EXPECT_EQ(gauge.Value(), 1.0);
+}
+
 TEST(GaugeTest, dec_number) {
   Gauge gauge;
   gauge.Set(5.0);
diff --git a/core/tests/histogram_test.cc b/core/tests/histogram_test.cc
index 1ef26bd2..ef8ecda6 100644
--- a/core/tests/histogram_test.cc
+++ b/core/tests/histogram_test.cc
@@ -1,8 +1,10 @@
 #include "prometheus/histogram.h"
 
-#include <limits>
+#include <gtest/gtest.h>
 
-#include <gmock/gmock.h>
+#include <limits>
+#include <memory>
+#include <stdexcept>
 
 namespace prometheus {
 namespace {
@@ -11,7 +13,7 @@ TEST(HistogramTest, initialize_with_zero) {
   Histogram histogram{{}};
   auto metric = histogram.Collect();
   auto h = metric.histogram;
-  EXPECT_EQ(h.sample_count, 0);
+  EXPECT_EQ(h.sample_count, 0U);
   EXPECT_EQ(h.sample_sum, 0);
 }
 
@@ -21,7 +23,7 @@ TEST(HistogramTest, sample_count) {
   histogram.Observe(200);
   auto metric = histogram.Collect();
   auto h = metric.histogram;
-  EXPECT_EQ(h.sample_count, 2);
+  EXPECT_EQ(h.sample_count, 2U);
 }
 
 TEST(HistogramTest, sample_sum) {
@@ -38,7 +40,7 @@ TEST(HistogramTest, bucket_size) {
   Histogram histogram{{1, 2}};
   auto metric = histogram.Collect();
   auto h = metric.histogram;
-  EXPECT_EQ(h.bucket.size(), 3);
+  EXPECT_EQ(h.bucket.size(), 3U);
 }
 
 TEST(HistogramTest, bucket_bounds) {
@@ -51,6 +53,14 @@ TEST(HistogramTest, bucket_bounds) {
             std::numeric_limits<double>::infinity());
 }
 
+TEST(HistogramTest, reject_unsorted_bucket_bounds) {
+  EXPECT_ANY_THROW(Histogram({2, 1}));
+}
+
+TEST(HistogramTest, reject_non_incrementing_bucket_bounds) {
+  EXPECT_ANY_THROW(Histogram({1, 2, 2, 3}));
+}
+
 TEST(HistogramTest, bucket_counts_not_reset_by_collection) {
   Histogram histogram{{1, 2}};
   histogram.Observe(1.5);
@@ -58,8 +68,8 @@ TEST(HistogramTest, bucket_counts_not_reset_by_collection) {
   histogram.Observe(1.5);
   auto metric = histogram.Collect();
   auto h = metric.histogram;
-  ASSERT_EQ(h.bucket.size(), 3);
-  EXPECT_EQ(h.bucket.at(1).cumulative_count, 2);
+  ASSERT_EQ(h.bucket.size(), 3U);
+  EXPECT_EQ(h.bucket.at(1).cumulative_count, 2U);
 }
 
 TEST(HistogramTest, cumulative_bucket_count) {
@@ -73,10 +83,67 @@ TEST(HistogramTest, cumulative_bucket_count) {
   histogram.Observe(3);
   auto metric = histogram.Collect();
   auto h = metric.histogram;
-  ASSERT_EQ(h.bucket.size(), 3);
-  EXPECT_EQ(h.bucket.at(0).cumulative_count, 3);
-  EXPECT_EQ(h.bucket.at(1).cumulative_count, 6);
-  EXPECT_EQ(h.bucket.at(2).cumulative_count, 7);
+  ASSERT_EQ(h.bucket.size(), 3U);
+  EXPECT_EQ(h.bucket.at(0).cumulative_count, 3U);
+  EXPECT_EQ(h.bucket.at(1).cumulative_count, 6U);
+  EXPECT_EQ(h.bucket.at(2).cumulative_count, 7U);
+}
+
+TEST(HistogramTest, observe_multiple_test_bucket_counts) {
+  Histogram histogram{{1, 2}};
+  histogram.ObserveMultiple({5, 9, 3}, 20);
+  histogram.ObserveMultiple({0, 20, 6}, 34);
+  auto metric = histogram.Collect();
+  auto h = metric.histogram;
+  ASSERT_EQ(h.bucket.size(), 3U);
+  EXPECT_EQ(h.bucket.at(0).cumulative_count, 5U);
+  EXPECT_EQ(h.bucket.at(1).cumulative_count, 34U);
+  EXPECT_EQ(h.bucket.at(2).cumulative_count, 43U);
+}
+
+TEST(HistogramTest, observe_multiple_test_total_sum) {
+  Histogram histogram{{1, 2}};
+  histogram.ObserveMultiple({5, 9, 3}, 20);
+  histogram.ObserveMultiple({0, 20, 6}, 34);
+  auto metric = histogram.Collect();
+  auto h = metric.histogram;
+  EXPECT_EQ(h.sample_count, 43U);
+  EXPECT_EQ(h.sample_sum, 54);
+}
+
+TEST(HistogramTest, observe_multiple_test_length_error) {
+  Histogram histogram{{1, 2}};
+  // 2 bucket boundaries means there are 3 buckets, so giving just 2 bucket
+  // increments should result in a length_error.
+  ASSERT_THROW(histogram.ObserveMultiple({5, 9}, 20), std::length_error);
+}
+
+TEST(HistogramTest, test_reset) {
+  Histogram histogram{{1, 2}};
+  histogram.ObserveMultiple({5, 9, 3}, 20);
+  histogram.ObserveMultiple({0, 20, 6}, 34);
+  histogram.Reset();
+  auto metric = histogram.Collect();
+  auto h = metric.histogram;
+  EXPECT_EQ(h.sample_count, 0U);
+  EXPECT_EQ(h.sample_sum, 0U);
+  EXPECT_EQ(h.bucket.at(0).cumulative_count, 0U);
+  EXPECT_EQ(h.bucket.at(1).cumulative_count, 0U);
+  EXPECT_EQ(h.bucket.at(2).cumulative_count, 0U);
+  histogram.ObserveMultiple({5, 9, 3}, 20);
+  histogram.ObserveMultiple({0, 20, 6}, 34);
+  metric = histogram.Collect();
+  h = metric.histogram;
+  EXPECT_EQ(h.sample_count, 43U);
+  EXPECT_EQ(h.sample_sum, 54);
+}
+
+TEST(HistogramTest, sum_can_go_down) {
+  Histogram histogram{{1}};
+  auto metric1 = histogram.Collect();
+  histogram.Observe(-10);
+  auto metric2 = histogram.Collect();
+  EXPECT_LT(metric2.histogram.sample_sum, metric1.histogram.sample_sum);
 }
 
 }  // namespace
diff --git a/core/tests/raii_locale.h b/core/tests/raii_locale.h
new file mode 100644
index 00000000..2fbd382d
--- /dev/null
+++ b/core/tests/raii_locale.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <locale>
+
+class RAIILocale {
+ public:
+  explicit RAIILocale(const char* name) {
+    std::locale::global(std::locale(name));
+  }
+
+  ~RAIILocale() { std::locale::global(savedLocale_); }
+
+  RAIILocale(const RAIILocale&) = delete;
+  RAIILocale(RAIILocale&&) = delete;
+  RAIILocale& operator=(const RAIILocale&) = delete;
+  RAIILocale& operator=(RAIILocale&&) = delete;
+
+ private:
+  const std::locale savedLocale_ = std::locale{};
+};
diff --git a/core/tests/registry_test.cc b/core/tests/registry_test.cc
index ee0b7d50..45b98ff2 100644
--- a/core/tests/registry_test.cc
+++ b/core/tests/registry_test.cc
@@ -1,10 +1,15 @@
 #include "prometheus/registry.h"
 
-#include <vector>
+#include <gtest/gtest.h>
 
-#include <gmock/gmock.h>
+#include <cstddef>
+#include <vector>
 
-#include "prometheus/collectable.h"
+#include "prometheus/counter.h"
+#include "prometheus/gauge.h"
+#include "prometheus/histogram.h"
+#include "prometheus/info.h"
+#include "prometheus/summary.h"
 
 namespace prometheus {
 namespace {
@@ -16,13 +21,13 @@ TEST(RegistryTest, collect_single_metric_family) {
   counter_family.Add({{"name", "counter1"}});
   counter_family.Add({{"name", "counter2"}});
   auto collected = registry.Collect();
-  ASSERT_EQ(collected.size(), 1);
+  ASSERT_EQ(collected.size(), 1U);
   EXPECT_EQ(collected[0].name, "test");
   EXPECT_EQ(collected[0].help, "a test");
-  ASSERT_EQ(collected[0].metric.size(), 2);
-  ASSERT_EQ(collected[0].metric.at(0).label.size(), 1);
+  ASSERT_EQ(collected[0].metric.size(), 2U);
+  ASSERT_EQ(collected[0].metric.at(0).label.size(), 1U);
   EXPECT_EQ(collected[0].metric.at(0).label.at(0).name, "name");
-  ASSERT_EQ(collected[0].metric.at(1).label.size(), 1);
+  ASSERT_EQ(collected[0].metric.at(1).label.size(), 1U);
   EXPECT_EQ(collected[0].metric.at(1).label.at(0).name, "name");
 }
 
@@ -34,7 +39,117 @@ TEST(RegistryTest, build_histogram_family) {
                                          Histogram::BucketBoundaries{0, 1, 2});
   histogram.Observe(1.1);
   auto collected = registry.Collect();
-  ASSERT_EQ(collected.size(), 1);
+  ASSERT_EQ(collected.size(), 1U);
+}
+
+TEST(RegistryTest, unable_to_remove_family) {
+  Family<Counter> family{"name", "help", {}};
+  Registry registry{};
+  EXPECT_FALSE(registry.Remove(family));
+}
+
+TEST(RegistryTest, remove_and_readd_family) {
+  Registry registry{Registry::InsertBehavior::Throw};
+
+  auto& counter = BuildCounter().Name("name").Register(registry);
+  EXPECT_TRUE(registry.Remove(counter));
+  EXPECT_NO_THROW(BuildCounter().Name("name").Register(registry));
+}
+
+TEST(RegistryTest, reject_different_type_than_counter) {
+  const auto same_name = std::string{"same_name"};
+  Registry registry{};
+
+  EXPECT_NO_THROW(BuildCounter().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildGauge().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildHistogram().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildInfo().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildSummary().Name(same_name).Register(registry));
+}
+
+TEST(RegistryTest, reject_different_type_than_gauge) {
+  const auto same_name = std::string{"same_name"};
+  Registry registry{};
+
+  EXPECT_NO_THROW(BuildGauge().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildCounter().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildHistogram().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildInfo().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildSummary().Name(same_name).Register(registry));
+}
+
+TEST(RegistryTest, reject_different_type_than_histogram) {
+  const auto same_name = std::string{"same_name"};
+  Registry registry{};
+
+  EXPECT_NO_THROW(BuildHistogram().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildInfo().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildCounter().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildGauge().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildSummary().Name(same_name).Register(registry));
+}
+
+TEST(RegistryTest, reject_different_type_than_info) {
+  const auto same_name = std::string{"same_name"};
+  Registry registry{};
+
+  EXPECT_NO_THROW(BuildInfo().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildCounter().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildGauge().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildSummary().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildHistogram().Name(same_name).Register(registry));
+}
+
+TEST(RegistryTest, reject_different_type_than_summary) {
+  const auto same_name = std::string{"same_name"};
+  Registry registry{};
+
+  EXPECT_NO_THROW(BuildSummary().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildCounter().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildGauge().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildHistogram().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildInfo().Name(same_name).Register(registry));
+}
+
+TEST(RegistryTest, throw_for_same_family_name) {
+  const auto same_name = std::string{"same_name"};
+  Registry registry{Registry::InsertBehavior::Throw};
+
+  EXPECT_NO_THROW(BuildCounter().Name(same_name).Register(registry));
+  EXPECT_ANY_THROW(BuildCounter().Name(same_name).Register(registry));
+}
+
+TEST(RegistryTest, merge_same_families) {
+  Registry registry{Registry::InsertBehavior::Merge};
+
+  std::size_t loops = 4;
+
+  while (loops-- > 0) {
+    BuildCounter()
+        .Name("counter")
+        .Help("Test Counter")
+        .Register(registry)
+        .Add({{"name", "test_counter"}});
+  }
+
+  auto collected = registry.Collect();
+  EXPECT_EQ(1U, collected.size());
+}
+
+TEST(RegistryTest, do_not_merge_families_with_different_labels) {
+  Registry registry{Registry::InsertBehavior::Merge};
+
+  EXPECT_NO_THROW(BuildCounter()
+                      .Name("counter")
+                      .Help("Test Counter")
+                      .Labels({{"a", "A"}})
+                      .Register(registry));
+
+  EXPECT_ANY_THROW(BuildCounter()
+                       .Name("counter")
+                       .Help("Test Counter")
+                       .Labels({{"b", "B"}})
+                       .Register(registry));
 }
 
 }  // namespace
diff --git a/core/tests/serializer_test.cc b/core/tests/serializer_test.cc
new file mode 100644
index 00000000..ebf8fd73
--- /dev/null
+++ b/core/tests/serializer_test.cc
@@ -0,0 +1,76 @@
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <memory>
+#include <sstream>
+#include <stdexcept>
+#include <vector>
+
+#include "prometheus/counter.h"
+#include "prometheus/detail/future_std.h"
+#include "prometheus/family.h"
+#include "prometheus/metric_family.h"
+#include "prometheus/text_serializer.h"
+#include "raii_locale.h"
+
+namespace prometheus {
+namespace {
+
+class SerializerTest : public testing::Test {
+ public:
+  void SetUp() override {
+    Family<Counter> family{"requests_total", "", {}};
+    auto& counter = family.Add({});
+    counter.Increment();
+
+    collected = family.Collect();
+  }
+
+  std::vector<MetricFamily> collected;
+  TextSerializer textSerializer;
+};
+
+#ifndef _WIN32
+// This test expects a working German locale to test that floating
+// point numbers do not use , but . as a delimiter.
+//
+// On Debian systems they can be generated by "locale-gen de_DE.UTF-8"
+TEST_F(SerializerTest, shouldSerializeLocaleIndependent) {
+  std::unique_ptr<RAIILocale> localeWithCommaDecimalSeparator;
+
+  // ignore missing locale and skip test if setup fails
+  try {
+    localeWithCommaDecimalSeparator =
+        detail::make_unique<RAIILocale>("de_DE.UTF-8");
+  } catch (std::runtime_error&) {
+    GTEST_SKIP();
+  }
+
+  const auto serialized = textSerializer.Serialize(collected);
+  EXPECT_THAT(serialized, testing::HasSubstr(" 1\n"));
+}
+#endif
+
+TEST_F(SerializerTest, shouldRestoreStreamState) {
+  std::ostringstream os;
+
+  // save stream state
+  auto saved_flags = os.flags();
+  auto saved_precision = os.precision();
+  auto saved_width = os.width();
+  auto saved_fill = os.fill();
+  auto saved_locale = os.getloc();
+
+  // serialize
+  textSerializer.Serialize(os, collected);
+
+  // check for expected flags
+  EXPECT_EQ(os.flags(), saved_flags);
+  EXPECT_EQ(os.precision(), saved_precision);
+  EXPECT_EQ(os.width(), saved_width);
+  EXPECT_EQ(os.fill(), saved_fill);
+  EXPECT_EQ(os.getloc(), saved_locale);
+}
+
+}  // namespace
+}  // namespace prometheus
diff --git a/core/tests/summary_test.cc b/core/tests/summary_test.cc
index 44133794..d1662a41 100644
--- a/core/tests/summary_test.cc
+++ b/core/tests/summary_test.cc
@@ -1,10 +1,13 @@
 #include "prometheus/summary.h"
 
+#include <gtest/gtest.h>
+
+#include <chrono>
 #include <cmath>
+#include <limits>
+#include <memory>
 #include <thread>
 
-#include <gmock/gmock.h>
-
 namespace prometheus {
 namespace {
 
@@ -12,7 +15,7 @@ TEST(SummaryTest, initialize_with_zero) {
   Summary summary{Summary::Quantiles{}};
   auto metric = summary.Collect();
   auto s = metric.summary;
-  EXPECT_EQ(s.sample_count, 0);
+  EXPECT_EQ(s.sample_count, 0U);
   EXPECT_EQ(s.sample_sum, 0);
 }
 
@@ -22,7 +25,7 @@ TEST(SummaryTest, sample_count) {
   summary.Observe(200);
   auto metric = summary.Collect();
   auto s = metric.summary;
-  EXPECT_EQ(s.sample_count, 2);
+  EXPECT_EQ(s.sample_count, 2U);
 }
 
 TEST(SummaryTest, sample_sum) {
@@ -39,28 +42,29 @@ TEST(SummaryTest, quantile_size) {
   Summary summary{Summary::Quantiles{{0.5, 0.05}, {0.90, 0.01}}};
   auto metric = summary.Collect();
   auto s = metric.summary;
-  EXPECT_EQ(s.quantile.size(), 2);
+  EXPECT_EQ(s.quantile.size(), 2U);
 }
 
 TEST(SummaryTest, quantile_bounds) {
   Summary summary{Summary::Quantiles{{0.5, 0.05}, {0.90, 0.01}, {0.99, 0.001}}};
   auto metric = summary.Collect();
   auto s = metric.summary;
-  ASSERT_EQ(s.quantile.size(), 3);
+  ASSERT_EQ(s.quantile.size(), 3U);
   EXPECT_DOUBLE_EQ(s.quantile.at(0).quantile, 0.5);
   EXPECT_DOUBLE_EQ(s.quantile.at(1).quantile, 0.9);
   EXPECT_DOUBLE_EQ(s.quantile.at(2).quantile, 0.99);
 }
 
 TEST(SummaryTest, quantile_values) {
-  static const int SAMPLES = 1000000;
+  static const int SAMPLES = 100000;
 
-  Summary summary{Summary::Quantiles{{0.5, 0.05}, {0.9, 0.01}, {0.99, 0.001}}};
+  Summary summary{Summary::Quantiles{{0.5, 0.05}, {0.9, 0.01}, {0.99, 0.001}},
+                  std::chrono::hours{1}};  // prevent rotation on slow CPUs
   for (int i = 1; i <= SAMPLES; ++i) summary.Observe(i);
 
   auto metric = summary.Collect();
   auto s = metric.summary;
-  ASSERT_EQ(s.quantile.size(), 3);
+  ASSERT_EQ(s.quantile.size(), 3U);
 
   EXPECT_NEAR(s.quantile.at(0).value, 0.5 * SAMPLES, 0.05 * SAMPLES);
   EXPECT_NEAR(s.quantile.at(1).value, 0.9 * SAMPLES, 0.01 * SAMPLES);
@@ -72,10 +76,10 @@ TEST(SummaryTest, max_age) {
                   2};
   summary.Observe(8.0);
 
-  static const auto test_value = [&summary](double ref) {
+  const auto test_value = [&summary](double ref) {
     auto metric = summary.Collect();
     auto s = metric.summary;
-    ASSERT_EQ(s.quantile.size(), 1);
+    ASSERT_EQ(s.quantile.size(), 1U);
 
     if (std::isnan(ref))
       EXPECT_TRUE(std::isnan(s.quantile.at(0).value));
@@ -90,5 +94,13 @@ TEST(SummaryTest, max_age) {
   test_value(std::numeric_limits<double>::quiet_NaN());
 }
 
+TEST(SummaryTest, construction_with_dynamic_quantile_vector) {
+  auto quantiles = Summary::Quantiles{{0.99, 0.001}};
+  quantiles.push_back({0.5, 0.05});
+
+  Summary summary{quantiles, std::chrono::seconds(1), 2};
+  summary.Observe(8.0);
+}
+
 }  // namespace
 }  // namespace prometheus
diff --git a/core/tests/text_serializer_test.cc b/core/tests/text_serializer_test.cc
new file mode 100644
index 00000000..470583c4
--- /dev/null
+++ b/core/tests/text_serializer_test.cc
@@ -0,0 +1,132 @@
+#include "prometheus/text_serializer.h"
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <cmath>
+#include <limits>
+#include <string>
+
+#include "prometheus/client_metric.h"
+#include "prometheus/histogram.h"
+#include "prometheus/info.h"
+#include "prometheus/metric_family.h"
+#include "prometheus/metric_type.h"
+#include "prometheus/summary.h"
+
+namespace prometheus {
+namespace {
+
+class TextSerializerTest : public testing::Test {
+ public:
+  std::string Serialize(MetricType type) const {
+    MetricFamily metricFamily;
+    metricFamily.name = name;
+    metricFamily.help = "my metric help text";
+    metricFamily.type = type;
+    metricFamily.metric = std::vector<ClientMetric>{metric};
+
+    std::vector<MetricFamily> families{metricFamily};
+
+    return textSerializer.Serialize(families);
+  }
+
+  const std::string name = "my_metric";
+  ClientMetric metric;
+  TextSerializer textSerializer;
+};
+
+TEST_F(TextSerializerTest, shouldSerializeNotANumber) {
+  metric.gauge.value = std::nan("");
+  EXPECT_THAT(Serialize(MetricType::Gauge), testing::HasSubstr(name + " Nan"));
+}
+
+TEST_F(TextSerializerTest, shouldSerializeNegativeInfinity) {
+  metric.gauge.value = -std::numeric_limits<double>::infinity();
+  EXPECT_THAT(Serialize(MetricType::Gauge), testing::HasSubstr(name + " -Inf"));
+}
+
+TEST_F(TextSerializerTest, shouldSerializePositiveInfinity) {
+  metric.gauge.value = std::numeric_limits<double>::infinity();
+  EXPECT_THAT(Serialize(MetricType::Gauge), testing::HasSubstr(name + " +Inf"));
+}
+
+TEST_F(TextSerializerTest, shouldEscapeBackslash) {
+  metric.label.resize(1, ClientMetric::Label{"k", "v\\v"});
+  EXPECT_THAT(Serialize(MetricType::Gauge),
+              testing::HasSubstr(name + "{k=\"v\\\\v\"}"));
+}
+
+TEST_F(TextSerializerTest, shouldEscapeNewline) {
+  metric.label.resize(1, ClientMetric::Label{"k", "v\nv"});
+  EXPECT_THAT(Serialize(MetricType::Gauge),
+              testing::HasSubstr(name + "{k=\"v\\nv\"}"));
+}
+
+TEST_F(TextSerializerTest, shouldEscapeDoubleQuote) {
+  metric.label.resize(1, ClientMetric::Label{"k", "v\"v"});
+  EXPECT_THAT(Serialize(MetricType::Gauge),
+              testing::HasSubstr(name + "{k=\"v\\\"v\"}"));
+}
+
+TEST_F(TextSerializerTest, shouldSerializeUntyped) {
+  metric.untyped.value = 64.0;
+
+  const auto serialized = Serialize(MetricType::Untyped);
+  EXPECT_THAT(serialized, testing::HasSubstr(name + " 64\n"));
+}
+
+TEST_F(TextSerializerTest, shouldSerializeTimestamp) {
+  metric.counter.value = 64.0;
+  metric.timestamp_ms = 1234;
+
+  const auto serialized = Serialize(MetricType::Counter);
+  EXPECT_THAT(serialized, testing::HasSubstr(name + " 64 1234\n"));
+}
+
+TEST_F(TextSerializerTest, shouldSerializeHistogramWithNoBuckets) {
+  metric.histogram.sample_count = 2;
+  metric.histogram.sample_sum = 32.0;
+
+  const auto serialized = Serialize(MetricType::Histogram);
+  EXPECT_THAT(serialized, testing::HasSubstr(name + "_count 2"));
+  EXPECT_THAT(serialized, testing::HasSubstr(name + "_sum 32\n"));
+  EXPECT_THAT(serialized, testing::HasSubstr(name + "_bucket{le=\"+Inf\"} 2"));
+}
+
+TEST_F(TextSerializerTest, shouldSerializeHistogram) {
+  Histogram histogram{{1}};
+  histogram.Observe(0);
+  histogram.Observe(200);
+  metric = histogram.Collect();
+
+  const auto serialized = Serialize(MetricType::Histogram);
+  EXPECT_THAT(serialized, testing::HasSubstr(name + "_count 2\n"));
+  EXPECT_THAT(serialized, testing::HasSubstr(name + "_sum 200\n"));
+  EXPECT_THAT(serialized, testing::HasSubstr(name + "_bucket{le=\"1\"} 1\n"));
+  EXPECT_THAT(serialized,
+              testing::HasSubstr(name + "_bucket{le=\"+Inf\"} 2\n"));
+}
+
+TEST_F(TextSerializerTest, shouldSerializeInfo) {
+  Info info;
+  metric = info.Collect();
+
+  const auto serialized = Serialize(MetricType::Info);
+  EXPECT_THAT(serialized, testing::HasSubstr(name + "_info 1"));
+}
+
+TEST_F(TextSerializerTest, shouldSerializeSummary) {
+  Summary summary{Summary::Quantiles{{0.5, 0.05}}};
+  summary.Observe(0);
+  summary.Observe(200);
+  metric = summary.Collect();
+
+  const auto serialized = Serialize(MetricType::Summary);
+  EXPECT_THAT(serialized, testing::HasSubstr(name + "_count 2"));
+  EXPECT_THAT(serialized, testing::HasSubstr(name + "_sum 200\n"));
+  EXPECT_THAT(serialized, testing::HasSubstr(name + "{quantile=\"0.5\"} 0\n"));
+}
+
+}  // namespace
+}  // namespace prometheus
diff --git a/core/tests/utils_test.cc b/core/tests/utils_test.cc
new file mode 100644
index 00000000..b519ca20
--- /dev/null
+++ b/core/tests/utils_test.cc
@@ -0,0 +1,33 @@
+#include "prometheus/detail/utils.h"
+
+#include <gtest/gtest.h>
+
+namespace prometheus {
+
+namespace {
+
+class UtilsTest : public testing::Test {
+ public:
+  detail::LabelHasher hasher;
+};
+
+TEST_F(UtilsTest, hash_labels_1) {
+  Labels labels{{"key1", "value1"}, {"key2", "value2"}};
+  EXPECT_EQ(hasher(labels), hasher(labels));
+}
+
+TEST_F(UtilsTest, hash_labels_2) {
+  Labels labels1{{"aa", "bb"}};
+  Labels labels2{{"a", "abb"}};
+  EXPECT_NE(hasher(labels1), hasher(labels2));
+}
+
+TEST_F(UtilsTest, hash_label_3) {
+  Labels labels1{{"a", "a"}};
+  Labels labels2{{"aa", ""}};
+  EXPECT_NE(hasher(labels1), hasher(labels2));
+}
+
+}  // namespace
+
+}  // namespace prometheus
diff --git a/doc/Doxyfile b/doc/Doxyfile
new file mode 100644
index 00000000..14a657e4
--- /dev/null
+++ b/doc/Doxyfile
@@ -0,0 +1,13 @@
+PROJECT_NAME           = "Prometheus Client Library for Modern C++"
+
+EXCLUDE_PATTERNS       = */detail/*
+EXCLUDE_SYMBOLS        = prometheus::detail::*
+FILE_PATTERNS          = *.h *.cc
+GENERATE_LATEX         = NO
+GRAPHICAL_HIERARCHY    = NO
+INPUT                  = ../README.md ../core/include ../core/src ../pull/include ../pull/src ../push/include ../push/src
+RECURSIVE              = YES
+SHOW_FILES             = NO
+SHOW_INCLUDE_FILES     = NO
+SHOW_USED_FILES        = NO
+USE_MDFILE_AS_MAINPAGE = ../README.md
diff --git a/pull/BUILD.bazel b/pull/BUILD.bazel
index a5ae5df7..838d3d13 100644
--- a/pull/BUILD.bazel
+++ b/pull/BUILD.bazel
@@ -1,3 +1,11 @@
+load("//bazel:export_header.bzl", "generate_dummy_export_header")
+
+generate_dummy_export_header(
+    name = "export_header",
+    basename = "PROMETHEUS_CPP_PULL",
+    header = "include/prometheus/detail/pull_export.h",
+)
+
 cc_library(
     name = "pull",
     srcs = glob([
@@ -6,15 +14,16 @@ cc_library(
     ]),
     hdrs = glob(
         ["include/**/*.h"],
-    ),
-    copts = [
-        "-DHAVE_ZLIB",
+    ) + [":export_header"],
+    local_defines = [
+        "HAVE_ZLIB",
     ],
     strip_include_prefix = "include",
     visibility = ["//visibility:public"],
     deps = [
         "//core",
-        "@civetweb",
-        "@net_zlib_zlib//:z",
+        "//util",
+        "@civetweb//:civetserver",
+        "@zlib",
     ],
 )
diff --git a/pull/CMakeLists.txt b/pull/CMakeLists.txt
index 337e21f3..162987de 100644
--- a/pull/CMakeLists.txt
+++ b/pull/CMakeLists.txt
@@ -1,8 +1,20 @@
-
 if(USE_THIRDPARTY_LIBRARIES)
   find_package(civetweb-3rdparty CONFIG REQUIRED)
+  add_library(${PROJECT_NAME}::civetweb ALIAS civetweb)
+  install(
+    TARGETS civetweb
+    EXPORT ${PROJECT_NAME}-targets
+    # keep embedded civetweb headers scoped to prometheus(-cpp)
+    PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/prometheus
+  )
 else()
-  find_package(CivetWeb REQUIRED)
+  find_package(civetweb CONFIG REQUIRED)
+
+  # work-around https://github.com/civetweb/civetweb/pull/918
+  if(WIN32 AND NOT TARGET WINSOCK::WINSOCK)
+    add_library(WINSOCK::WINSOCK INTERFACE IMPORTED)
+    target_link_libraries(WINSOCK::WINSOCK INTERFACE ws2_32)
+  endif()
 endif()
 
 if(ENABLE_COMPRESSION)
@@ -10,27 +22,39 @@ if(ENABLE_COMPRESSION)
 endif()
 
 add_library(pull
+  src/basic_auth.cc
+  src/basic_auth.h
+  src/endpoint.cc
+  src/endpoint.h
   src/exposer.cc
   src/handler.cc
   src/handler.h
-  $<$<BOOL:${USE_THIRDPARTY_LIBRARIES}>:$<TARGET_OBJECTS:civetweb>>
+  src/metrics_collector.cc
+  src/metrics_collector.h
 )
 
 add_library(${PROJECT_NAME}::pull ALIAS pull)
 
+target_compile_features(pull
+  PUBLIC
+    cxx_std_11
+)
+
 target_link_libraries(pull
   PUBLIC
     ${PROJECT_NAME}::core
   PRIVATE
+    ${PROJECT_NAME}::util
     Threads::Threads
-    ${CIVETWEB_LIBRARIES}
-    $<$<AND:$<BOOL:UNIX>,$<NOT:$<BOOL:APPLE>>>:rt>
+    $<IF:$<BOOL:${USE_THIRDPARTY_LIBRARIES}>,${PROJECT_NAME}::civetweb,civetweb::civetweb-cpp>
+    $<$<AND:$<BOOL:${UNIX}>,$<NOT:$<BOOL:${APPLE}>>>:rt>
     $<$<BOOL:${ENABLE_COMPRESSION}>:ZLIB::ZLIB>
 )
 
 target_include_directories(pull
   PUBLIC
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>
   PRIVATE
     ${CIVETWEB_INCLUDE_DIRS}
 )
@@ -40,7 +64,18 @@ target_compile_definitions(pull
     $<$<BOOL:${ENABLE_COMPRESSION}>:HAVE_ZLIB>
 )
 
-set_target_properties(pull PROPERTIES OUTPUT_NAME ${PROJECT_NAME}-pull)
+set_target_properties(pull
+  PROPERTIES
+    OUTPUT_NAME ${PROJECT_NAME}-pull
+    DEFINE_SYMBOL PROMETHEUS_CPP_PULL_EXPORTS
+    VERSION "${PROJECT_VERSION}"
+    SOVERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}"
+)
+
+generate_export_header(pull
+  BASE_NAME ${PROJECT_NAME}-pull
+  EXPORT_FILE_NAME include/prometheus/detail/pull_export.h
+)
 
 install(
   TARGETS pull
@@ -52,10 +87,41 @@ install(
 )
 
 install(
-  DIRECTORY include/
+  DIRECTORY include/ ${CMAKE_CURRENT_BINARY_DIR}/include/
   DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )
 
+if(GENERATE_PKGCONFIG)
+  set(PKGCONFIG_LIBS)
+  set(PKGCONFIG_REQUIRES)
+
+  if(NOT USE_THIRDPARTY_LIBRARIES)
+    string(APPEND PKGCONFIG_LIBS " -lcivetweb-cpp -lcivetweb")
+  endif()
+
+  if(ENABLE_COMPRESSION)
+    string(APPEND PKGCONFIG_REQUIRES " zlib")
+  endif()
+
+  configure_file(
+    ${PROJECT_SOURCE_DIR}/cmake/prometheus-cpp-pull.pc.in
+    ${CMAKE_CURRENT_BINARY_DIR}/prometheus-cpp-pull.pc
+    @ONLY
+  )
+
+  install(
+    FILES ${CMAKE_CURRENT_BINARY_DIR}/prometheus-cpp-pull.pc
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
+  )
+
+  unset(PKGCONFIG_LIBS)
+  unset(PKGCONFIG_REQUIRES)
+endif()
+
 if(ENABLE_TESTING)
+  add_library(pull_internal_headers INTERFACE)
+  add_library(${PROJECT_NAME}::pull_internal_headers ALIAS pull_internal_headers)
+  target_include_directories(pull_internal_headers INTERFACE src)
+
   add_subdirectory(tests)
 endif()
diff --git a/pull/include/prometheus/exposer.h b/pull/include/prometheus/exposer.h
index c318f751..93e0b2b5 100644
--- a/pull/include/prometheus/exposer.h
+++ b/pull/include/prometheus/exposer.h
@@ -1,35 +1,56 @@
 #pragma once
 
-#include <atomic>
-#include <cstdint>
+#include <cstddef>
+#include <functional>
 #include <memory>
+#include <mutex>
 #include <string>
 #include <vector>
 
 #include "prometheus/collectable.h"
-#include "prometheus/registry.h"
+#include "prometheus/detail/pull_export.h"
 
 class CivetServer;
+struct CivetCallbacks;
 
 namespace prometheus {
 
 namespace detail {
-class MetricsHandler;
+class Endpoint;
 }  // namespace detail
 
-class Exposer {
+class PROMETHEUS_CPP_PULL_EXPORT Exposer {
  public:
-  explicit Exposer(const std::string& bind_address,
-                   const std::string& uri = std::string("/metrics"));
+  explicit Exposer(const std::string& bind_address, std::size_t num_threads = 2,
+                   const CivetCallbacks* callbacks = nullptr);
+  explicit Exposer(std::vector<std::string> options,
+                   const CivetCallbacks* callbacks = nullptr);
   ~Exposer();
-  void RegisterCollectable(const std::weak_ptr<Collectable>& collectable);
+
+  Exposer(const Exposer&) = delete;
+  Exposer(Exposer&&) = delete;
+  Exposer& operator=(const Exposer&) = delete;
+  Exposer& operator=(Exposer&&) = delete;
+
+  void RegisterCollectable(const std::weak_ptr<Collectable>& collectable,
+                           const std::string& uri = std::string("/metrics"));
+
+  void RegisterAuth(
+      std::function<bool(const std::string&, const std::string&)> authCB,
+      const std::string& realm = "Prometheus-cpp Exporter",
+      const std::string& uri = std::string("/metrics"));
+
+  void RemoveCollectable(const std::weak_ptr<Collectable>& collectable,
+                         const std::string& uri = std::string("/metrics"));
+
+  std::vector<int> GetListeningPorts() const;
 
  private:
+  detail::Endpoint& GetEndpointForUri(const std::string& uri);
+
   std::unique_ptr<CivetServer> server_;
-  std::vector<std::weak_ptr<Collectable>> collectables_;
-  std::shared_ptr<Registry> exposer_registry_;
-  std::unique_ptr<detail::MetricsHandler> metrics_handler_;
-  std::string uri_;
+  std::vector<std::unique_ptr<detail::Endpoint>> endpoints_;
+  std::mutex mutex_;
 };
 
 }  // namespace prometheus
diff --git a/pull/src/basic_auth.cc b/pull/src/basic_auth.cc
new file mode 100644
index 00000000..1d119064
--- /dev/null
+++ b/pull/src/basic_auth.cc
@@ -0,0 +1,74 @@
+#include "basic_auth.h"
+
+#include <utility>
+
+#include "CivetServer.h"
+#include "prometheus/detail/base64.h"
+
+namespace prometheus {
+
+BasicAuthHandler::BasicAuthHandler(AuthFunc callback, std::string realm)
+    : callback_(std::move(callback)), realm_(std::move(realm)) {}
+
+bool BasicAuthHandler::authorize(CivetServer* server, mg_connection* conn) {
+  if (!AuthorizeInner(server, conn)) {
+    WriteUnauthorizedResponse(conn);
+    return false;
+  }
+  return true;
+}
+
+bool BasicAuthHandler::AuthorizeInner(CivetServer*, mg_connection* conn) {
+  const char* authHeader = mg_get_header(conn, "Authorization");
+
+  if (authHeader == nullptr) {
+    // No auth header was provided.
+    return false;
+  }
+  std::string authHeaderStr = authHeader;
+
+  // Basic auth header is expected to be of the form:
+  // "Basic dXNlcm5hbWU6cGFzc3dvcmQ="
+
+  const std::string prefix = "Basic ";
+  if (authHeaderStr.compare(0, prefix.size(), prefix) != 0) {
+    return false;
+  }
+
+  // Strip the "Basic " prefix leaving the base64 encoded auth string
+  auto b64Auth = authHeaderStr.substr(prefix.size());
+
+  std::string decoded;
+  try {
+    decoded = detail::base64_decode(b64Auth);
+  } catch (...) {
+    return false;
+  }
+
+  // decoded auth string is expected to be of the form:
+  // "username:password"
+  // colons may not appear in the username.
+  auto splitPos = decoded.find(':');
+  if (splitPos == std::string::npos) {
+    return false;
+  }
+
+  auto username = decoded.substr(0, splitPos);
+  auto password = decoded.substr(splitPos + 1);
+
+  // TODO: bool does not permit a distinction between 401 Unauthorized
+  //  and 403 Forbidden. Authentication may succeed, but the user still
+  //  not be authorized to perform the request.
+  return callback_(username, password);
+}
+
+void BasicAuthHandler::WriteUnauthorizedResponse(mg_connection* conn) {
+  mg_printf(conn, "HTTP/1.1 401 Unauthorized\r\n");
+  mg_printf(conn, "WWW-Authenticate: Basic realm=\"%s\"\r\n", realm_.c_str());
+  mg_printf(conn, "Connection: close\r\n");
+  mg_printf(conn, "Content-Length: 0\r\n");
+  // end headers
+  mg_printf(conn, "\r\n");
+}
+
+}  // namespace prometheus
diff --git a/pull/src/basic_auth.h b/pull/src/basic_auth.h
new file mode 100644
index 00000000..3047b951
--- /dev/null
+++ b/pull/src/basic_auth.h
@@ -0,0 +1,38 @@
+#pragma once
+
+#include <functional>
+#include <string>
+
+#include "CivetServer.h"
+#include "civetweb.h"
+
+namespace prometheus {
+
+/**
+ * Handler for HTTP Basic authentication for Endpoints.
+ */
+class BasicAuthHandler : public CivetAuthHandler {
+ public:
+  using AuthFunc = std::function<bool(const std::string&, const std::string&)>;
+  explicit BasicAuthHandler(AuthFunc callback, std::string realm);
+
+  /**
+   * Implements civetweb authorization interface.
+   *
+   * Attempts to extract a username and password from the Authorization header
+   * to pass to the owning AuthHandler, `this->handler`.
+   * If handler returns true, permits the request to proceed.
+   * If handler returns false, or the Auth header is absent,
+   * rejects the request with 401 Unauthorized.
+   */
+  bool authorize(CivetServer* server, mg_connection* conn) override;
+
+ private:
+  bool AuthorizeInner(CivetServer* server, mg_connection* conn);
+  void WriteUnauthorizedResponse(mg_connection* conn);
+
+  AuthFunc callback_;
+  std::string realm_;
+};
+
+}  // namespace prometheus
diff --git a/pull/src/endpoint.cc b/pull/src/endpoint.cc
new file mode 100644
index 00000000..bd98cef4
--- /dev/null
+++ b/pull/src/endpoint.cc
@@ -0,0 +1,53 @@
+#include "endpoint.h"
+
+#include <utility>
+
+#include "basic_auth.h"
+#include "handler.h"
+#include "prometheus/detail/future_std.h"
+
+namespace prometheus {
+namespace detail {
+
+Endpoint::Endpoint(CivetServer& server, std::string uri)
+    : server_(server),
+      uri_(std::move(uri)),
+      endpoint_registry_(std::make_shared<Registry>()),
+      metrics_handler_(
+          detail::make_unique<MetricsHandler>(*endpoint_registry_)) {
+  RegisterCollectable(endpoint_registry_);
+  server_.addHandler(uri_, metrics_handler_.get());
+}
+
+Endpoint::~Endpoint() {
+  server_.removeHandler(uri_);
+  if (auth_handler_) {
+    server_.removeAuthHandler(uri_);
+  }
+}
+
+void Endpoint::RegisterCollectable(
+    const std::weak_ptr<Collectable>& collectable) {
+  metrics_handler_->RegisterCollectable(collectable);
+}
+
+void Endpoint::RegisterAuth(
+    std::function<bool(const std::string&, const std::string&)> authCB,
+    const std::string& realm) {
+  // split creating, assigning, and storing to avoid a race-condition when
+  // being called the second time and the handler is replaced
+  auto new_handler =
+      detail::make_unique<BasicAuthHandler>(std::move(authCB), realm);
+  server_.addAuthHandler(uri_, new_handler.get());
+  auth_handler_ = std::move(new_handler);
+}
+
+void Endpoint::RemoveCollectable(
+    const std::weak_ptr<Collectable>& collectable) {
+  metrics_handler_->RemoveCollectable(collectable);
+}
+
+const std::string& Endpoint::GetURI() const { return uri_; }
+
+}  // namespace detail
+}  // namespace prometheus
diff --git a/pull/src/endpoint.h b/pull/src/endpoint.h
new file mode 100644
index 00000000..81bb48f9
--- /dev/null
+++ b/pull/src/endpoint.h
@@ -0,0 +1,44 @@
+#pragma once
+
+#include <functional>
+#include <memory>
+#include <string>
+
+#include "CivetServer.h"
+#include "basic_auth.h"
+#include "prometheus/collectable.h"
+#include "prometheus/registry.h"
+
+namespace prometheus {
+namespace detail {
+class MetricsHandler;
+
+class Endpoint {
+ public:
+  explicit Endpoint(CivetServer& server, std::string uri);
+  ~Endpoint();
+
+  Endpoint(const Endpoint&) = delete;
+  Endpoint(Endpoint&&) = delete;
+  Endpoint& operator=(const Endpoint&) = delete;
+  Endpoint& operator=(Endpoint&&) = delete;
+
+  void RegisterCollectable(const std::weak_ptr<Collectable>& collectable);
+  void RegisterAuth(
+      std::function<bool(const std::string&, const std::string&)> authCB,
+      const std::string& realm);
+  void RemoveCollectable(const std::weak_ptr<Collectable>& collectable);
+
+  const std::string& GetURI() const;
+
+ private:
+  CivetServer& server_;
+  const std::string uri_;
+  // registry for "meta" metrics about the endpoint itself
+  std::shared_ptr<Registry> endpoint_registry_;
+  std::unique_ptr<MetricsHandler> metrics_handler_;
+  std::unique_ptr<BasicAuthHandler> auth_handler_;
+};
+
+}  // namespace detail
+}  // namespace prometheus
diff --git a/pull/src/exposer.cc b/pull/src/exposer.cc
index be8fa730..5ee3adea 100644
--- a/pull/src/exposer.cc
+++ b/pull/src/exposer.cc
@@ -1,31 +1,67 @@
 #include "prometheus/exposer.h"
 
-#include <chrono>
+#include <algorithm>
+#include <iterator>
 #include <string>
-#include <thread>
-
-#include "prometheus/client_metric.h"
+#include <utility>
 
 #include "CivetServer.h"
-#include "handler.h"
+#include "endpoint.h"
+#include "prometheus/detail/future_std.h"
 
 namespace prometheus {
 
-Exposer::Exposer(const std::string& bind_address, const std::string& uri)
-    : server_(new CivetServer{
-          {"listening_ports", bind_address.c_str(), "num_threads", "2"}}),
-      exposer_registry_(std::make_shared<Registry>()),
-      metrics_handler_(
-          new detail::MetricsHandler{collectables_, *exposer_registry_}),
-      uri_(uri) {
-  RegisterCollectable(exposer_registry_);
-  server_->addHandler(uri, metrics_handler_.get());
+Exposer::Exposer(const std::string& bind_address, const std::size_t num_threads,
+                 const CivetCallbacks* callbacks)
+    : Exposer(
+          std::vector<std::string>{"listening_ports", bind_address,
+                                   "num_threads", std::to_string(num_threads)},
+          callbacks) {}
+
+Exposer::Exposer(std::vector<std::string> options,
+                 const CivetCallbacks* callbacks)
+    : server_(detail::make_unique<CivetServer>(std::move(options), callbacks)) {
+}
+
+Exposer::~Exposer() = default;
+
+void Exposer::RegisterCollectable(const std::weak_ptr<Collectable>& collectable,
+                                  const std::string& uri) {
+  std::lock_guard<std::mutex> lock{mutex_};
+  auto& endpoint = GetEndpointForUri(uri);
+  endpoint.RegisterCollectable(collectable);
+}
+
+void Exposer::RegisterAuth(
+    std::function<bool(const std::string&, const std::string&)> authCB,
+    const std::string& realm, const std::string& uri) {
+  std::lock_guard<std::mutex> lock{mutex_};
+  auto& endpoint = GetEndpointForUri(uri);
+  endpoint.RegisterAuth(std::move(authCB), realm);
+}
+
+void Exposer::RemoveCollectable(const std::weak_ptr<Collectable>& collectable,
+                                const std::string& uri) {
+  std::lock_guard<std::mutex> lock{mutex_};
+  auto& endpoint = GetEndpointForUri(uri);
+  endpoint.RemoveCollectable(collectable);
 }
 
-Exposer::~Exposer() { server_->removeHandler(uri_); }
+std::vector<int> Exposer::GetListeningPorts() const {
+  return server_->getListeningPorts();
+}
+
+detail::Endpoint& Exposer::GetEndpointForUri(const std::string& uri) {
+  auto sameUri = [uri](const std::unique_ptr<detail::Endpoint>& endpoint) {
+    return endpoint->GetURI() == uri;
+  };
+  auto it = std::find_if(std::begin(endpoints_), std::end(endpoints_), sameUri);
+  if (it != std::end(endpoints_)) {
+    return *it->get();
+  }
 
-void Exposer::RegisterCollectable(
-    const std::weak_ptr<Collectable>& collectable) {
-  collectables_.push_back(collectable);
+  endpoints_.emplace_back(detail::make_unique<detail::Endpoint>(*server_, uri));
+  return *endpoints_.back().get();
 }
+
 }  // namespace prometheus
diff --git a/pull/src/handler.cc b/pull/src/handler.cc
index a81d7787..784fd5e7 100644
--- a/pull/src/handler.cc
+++ b/pull/src/handler.cc
@@ -1,23 +1,34 @@
 #include "handler.h"
 
+#include <algorithm>
+#include <chrono>
 #include <cstring>
 #include <iterator>
+#include <string>
 
 #ifdef HAVE_ZLIB
+#include <zconf.h>
 #include <zlib.h>
 #endif
 
-#include "prometheus/serializer.h"
+#include "civetweb.h"
+#include "metrics_collector.h"
+#include "prometheus/counter.h"
+#include "prometheus/metric_family.h"
+#include "prometheus/summary.h"
 #include "prometheus/text_serializer.h"
 
+#if CIVETWEB_VERSION_MAJOR < 1 || \
+    (CIVETWEB_VERSION_MAJOR == 1 && CIVETWEB_VERSION_MINOR < 14)
+// https://github.com/civetweb/civetweb/issues/954
+#error "Civetweb version 1.14 or higher required"
+#endif
+
 namespace prometheus {
 namespace detail {
 
-MetricsHandler::MetricsHandler(
-    const std::vector<std::weak_ptr<Collectable>>& collectables,
-    Registry& registry)
-    : collectables_(collectables),
-      bytes_transferred_family_(
+MetricsHandler::MetricsHandler(Registry& registry)
+    : bytes_transferred_family_(
           BuildCounter()
               .Name("exposer_transferred_bytes_total")
               .Help("Transferred bytes to metrics services")
@@ -89,7 +100,7 @@ static std::size_t WriteResponse(struct mg_connection* conn,
                                  const std::string& body) {
   mg_printf(conn,
             "HTTP/1.1 200 OK\r\n"
-            "Content-Type: text/plain\r\n");
+            "Content-Type: text/plain; charset=utf-8\r\n");
 
 #ifdef HAVE_ZLIB
   auto acceptsGzip = IsEncodingAccepted(conn, "gzip");
@@ -113,15 +124,40 @@ static std::size_t WriteResponse(struct mg_connection* conn,
   return body.size();
 }
 
-bool MetricsHandler::handleGet(CivetServer* server,
-                               struct mg_connection* conn) {
+void MetricsHandler::RegisterCollectable(
+    const std::weak_ptr<Collectable>& collectable) {
+  std::lock_guard<std::mutex> lock{collectables_mutex_};
+  CleanupStalePointers(collectables_);
+  collectables_.push_back(collectable);
+}
+
+void MetricsHandler::RemoveCollectable(
+    const std::weak_ptr<Collectable>& collectable) {
+  std::lock_guard<std::mutex> lock{collectables_mutex_};
+
+  auto locked = collectable.lock();
+  auto same_pointer = [&locked](const std::weak_ptr<Collectable>& candidate) {
+    return locked == candidate.lock();
+  };
+
+  collectables_.erase(std::remove_if(std::begin(collectables_),
+                                     std::end(collectables_), same_pointer),
+                      std::end(collectables_));
+}
+
+bool MetricsHandler::handleGet(CivetServer*, struct mg_connection* conn) {
   auto start_time_of_request = std::chrono::steady_clock::now();
 
-  auto metrics = CollectMetrics();
+  std::vector<MetricFamily> metrics;
+
+  {
+    std::lock_guard<std::mutex> lock{collectables_mutex_};
+    metrics = CollectMetrics(collectables_);
+  }
 
-  auto serializer = std::unique_ptr<Serializer>{new TextSerializer()};
+  const TextSerializer serializer;
 
-  auto bodySize = WriteResponse(conn, serializer->Serialize(metrics));
+  auto bodySize = WriteResponse(conn, serializer.Serialize(metrics));
 
   auto stop_time_of_request = std::chrono::steady_clock::now();
   auto duration = std::chrono::duration_cast<std::chrono::microseconds>(
@@ -132,22 +168,15 @@ bool MetricsHandler::handleGet(CivetServer* server,
   num_scrapes_.Increment();
   return true;
 }
-std::vector<MetricFamily> MetricsHandler::CollectMetrics() const {
-  auto collected_metrics = std::vector<MetricFamily>{};
-
-  for (auto&& wcollectable : collectables_) {
-    auto collectable = wcollectable.lock();
-    if (!collectable) {
-      continue;
-    }
-
-    auto&& metrics = collectable->Collect();
-    collected_metrics.insert(collected_metrics.end(),
-                             std::make_move_iterator(metrics.begin()),
-                             std::make_move_iterator(metrics.end()));
-  }
 
-  return collected_metrics;
+void MetricsHandler::CleanupStalePointers(
+    std::vector<std::weak_ptr<Collectable>>& collectables) {
+  collectables.erase(
+      std::remove_if(std::begin(collectables), std::end(collectables),
+                     [](const std::weak_ptr<Collectable>& candidate) {
+                       return candidate.expired();
+                     }),
+      std::end(collectables));
 }
 }  // namespace detail
 }  // namespace prometheus
diff --git a/pull/src/handler.h b/pull/src/handler.h
index 226651c4..10c90f9f 100644
--- a/pull/src/handler.h
+++ b/pull/src/handler.h
@@ -1,25 +1,33 @@
 #pragma once
 
 #include <memory>
+#include <mutex>
 #include <vector>
 
-
 #include "CivetServer.h"
+#include "prometheus/collectable.h"
+#include "prometheus/counter.h"
+#include "prometheus/family.h"
 #include "prometheus/registry.h"
+#include "prometheus/summary.h"
 
 namespace prometheus {
 namespace detail {
 class MetricsHandler : public CivetHandler {
  public:
-  MetricsHandler(const std::vector<std::weak_ptr<Collectable>>& collectables,
-                 Registry& registry);
+  explicit MetricsHandler(Registry& registry);
+
+  void RegisterCollectable(const std::weak_ptr<Collectable>& collectable);
+  void RemoveCollectable(const std::weak_ptr<Collectable>& collectable);
 
   bool handleGet(CivetServer* server, struct mg_connection* conn) override;
 
  private:
-  std::vector<MetricFamily> CollectMetrics() const;
+  static void CleanupStalePointers(
+      std::vector<std::weak_ptr<Collectable>>& collectables);
 
-  const std::vector<std::weak_ptr<Collectable>>& collectables_;
+  std::mutex collectables_mutex_;
+  std::vector<std::weak_ptr<Collectable>> collectables_;
   Family<Counter>& bytes_transferred_family_;
   Counter& bytes_transferred_;
   Family<Counter>& num_scrapes_family_;
@@ -27,5 +35,5 @@ class MetricsHandler : public CivetHandler {
   Family<Summary>& request_latencies_family_;
   Summary& request_latencies_;
 };
-}
-}
+}  // namespace detail
+}  // namespace prometheus
diff --git a/pull/src/metrics_collector.cc b/pull/src/metrics_collector.cc
new file mode 100644
index 00000000..0372d693
--- /dev/null
+++ b/pull/src/metrics_collector.cc
@@ -0,0 +1,30 @@
+#include "metrics_collector.h"
+
+#include <iterator>
+
+#include "prometheus/collectable.h"
+
+namespace prometheus {
+namespace detail {
+
+std::vector<MetricFamily> CollectMetrics(
+    const std::vector<std::weak_ptr<prometheus::Collectable>>& collectables) {
+  auto collected_metrics = std::vector<MetricFamily>{};
+
+  for (auto&& wcollectable : collectables) {
+    auto collectable = wcollectable.lock();
+    if (!collectable) {
+      continue;
+    }
+
+    auto&& metrics = collectable->Collect();
+    collected_metrics.insert(collected_metrics.end(),
+                             std::make_move_iterator(metrics.begin()),
+                             std::make_move_iterator(metrics.end()));
+  }
+
+  return collected_metrics;
+}
+
+}  // namespace detail
+}  // namespace prometheus
diff --git a/pull/src/metrics_collector.h b/pull/src/metrics_collector.h
new file mode 100644
index 00000000..4c3bb614
--- /dev/null
+++ b/pull/src/metrics_collector.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <memory>
+#include <vector>
+
+#include "prometheus/metric_family.h"
+
+namespace prometheus {
+class Collectable;
+namespace detail {
+std::vector<prometheus::MetricFamily> CollectMetrics(
+    const std::vector<std::weak_ptr<prometheus::Collectable>>& collectables);
+}  // namespace detail
+}  // namespace prometheus
diff --git a/pull/tests/CMakeLists.txt b/pull/tests/CMakeLists.txt
index 26e40e61..729c6ee0 100644
--- a/pull/tests/CMakeLists.txt
+++ b/pull/tests/CMakeLists.txt
@@ -1 +1,2 @@
 add_subdirectory(integration)
+add_subdirectory(unit)
diff --git a/pull/tests/integration/BUILD.bazel b/pull/tests/integration/BUILD.bazel
index 84fdb4b6..f4b7b6b0 100644
--- a/pull/tests/integration/BUILD.bazel
+++ b/pull/tests/integration/BUILD.bazel
@@ -4,6 +4,18 @@ cc_binary(
     deps = ["//pull"],
 )
 
+cc_binary(
+    name = "sample-server_multi",
+    srcs = ["sample_server_multi.cc"],
+    deps = ["//pull"],
+)
+
+cc_binary(
+    name = "sample-server_auth",
+    srcs = ["sample_server_auth.cc"],
+    deps = ["//pull"],
+)
+
 sh_test(
     name = "scrape-test",
     size = "small",
@@ -23,4 +35,16 @@ sh_test(
         "sample-server",
     ],
     tags = ["manual"],
-)
\ No newline at end of file
+)
+
+cc_test(
+    name = "integration_test",
+    srcs = ["integration_test.cc"],
+    copts = ["-Iexternal/googletest/include"],
+    linkstatic = True,
+    deps = [
+        "//pull",
+        "@curl",
+        "@googletest//:gtest_main",
+    ],
+)
diff --git a/pull/tests/integration/CMakeLists.txt b/pull/tests/integration/CMakeLists.txt
index 1ba22cdc..4478d92e 100644
--- a/pull/tests/integration/CMakeLists.txt
+++ b/pull/tests/integration/CMakeLists.txt
@@ -7,3 +7,41 @@ target_link_libraries(sample_server
   PRIVATE
     ${PROJECT_NAME}::pull
 )
+
+add_executable(sample_server_multi
+  sample_server_multi.cc
+)
+
+target_link_libraries(sample_server_multi
+  PRIVATE
+    ${PROJECT_NAME}::pull
+)
+
+add_executable(sample_server_auth
+  sample_server_auth.cc
+)
+
+target_link_libraries(sample_server_auth
+  PRIVATE
+     ${PROJECT_NAME}::pull
+)
+
+find_package(CURL)
+
+if(CURL_FOUND)
+  add_executable(prometheus_pull_integration_test
+    integration_test.cc
+  )
+
+  target_link_libraries(prometheus_pull_integration_test
+    PRIVATE
+      ${PROJECT_NAME}::pull
+      CURL::libcurl
+      GTest::gmock_main
+  )
+
+  add_test(
+    NAME prometheus_pull_integration_test
+    COMMAND prometheus_pull_integration_test
+  )
+endif()
diff --git a/pull/tests/integration/integration_test.cc b/pull/tests/integration/integration_test.cc
new file mode 100644
index 00000000..1493e043
--- /dev/null
+++ b/pull/tests/integration/integration_test.cc
@@ -0,0 +1,304 @@
+#include <curl/curl.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <cstddef>
+#include <functional>
+#include <memory>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+#include "prometheus/counter.h"
+#include "prometheus/detail/future_std.h"
+#include "prometheus/exposer.h"
+#include "prometheus/family.h"
+#include "prometheus/registry.h"
+
+namespace prometheus {
+namespace {
+
+using namespace testing;
+
+class IntegrationTest : public testing::Test {
+ public:
+  void SetUp() override {
+    exposer_ = detail::make_unique<Exposer>("127.0.0.1:0");
+    auto ports = exposer_->GetListeningPorts();
+    base_url_ = std::string("http://127.0.0.1:") + std::to_string(ports.at(0));
+  }
+
+  struct Response {
+    long code = 0;
+    std::string body;
+    std::string contentType;
+  };
+
+  std::function<void(CURL*)> fetchPrePerform_;
+
+  Response FetchMetrics(const std::string& metrics_path) const {
+    auto curl = std::shared_ptr<CURL>(curl_easy_init(), curl_easy_cleanup);
+    if (!curl) {
+      throw std::runtime_error("failed to initialize libcurl");
+    }
+
+    const auto url = base_url_ + metrics_path;
+    Response response;
+
+    curl_easy_setopt(curl.get(), CURLOPT_URL, url.c_str());
+    curl_easy_setopt(curl.get(), CURLOPT_WRITEDATA, &response.body);
+    curl_easy_setopt(curl.get(), CURLOPT_WRITEFUNCTION, WriteCallback);
+
+    if (fetchPrePerform_) {
+      fetchPrePerform_(curl.get());
+    }
+
+    CURLcode curl_error = curl_easy_perform(curl.get());
+    if (curl_error != CURLE_OK) {
+      throw std::runtime_error("failed to perform HTTP request");
+    }
+
+    curl_easy_getinfo(curl.get(), CURLINFO_RESPONSE_CODE, &response.code);
+
+    char* ct = nullptr;
+    curl_easy_getinfo(curl.get(), CURLINFO_CONTENT_TYPE, &ct);
+    if (ct) {
+      response.contentType = ct;
+    }
+
+    return response;
+  }
+
+  std::shared_ptr<Registry> RegisterSomeCounter(const std::string& name,
+                                                const std::string& path) const {
+    auto registry = std::make_shared<Registry>();
+
+    BuildCounter().Name(name).Register(*registry).Add({}).Increment();
+
+    exposer_->RegisterCollectable(registry, path);
+
+    return registry;
+  };
+
+  std::unique_ptr<Exposer> exposer_;
+
+  std::string base_url_;
+  std::string default_metrics_path_ = "/metrics";
+
+ private:
+  static std::size_t WriteCallback(void* contents, std::size_t size,
+                                   std::size_t nmemb, void* userp) {
+    auto response = reinterpret_cast<std::string*>(userp);
+
+    std::size_t realsize = size * nmemb;
+    response->append(reinterpret_cast<const char*>(contents), realsize);
+    return realsize;
+  }
+};
+
+TEST_F(IntegrationTest, doesNotExposeAnythingOnDefaultPath) {
+  const auto metrics = FetchMetrics(default_metrics_path_);
+
+  EXPECT_GE(metrics.code, 400);
+}
+
+TEST_F(IntegrationTest, exposeSingleCounter) {
+  const std::string counter_name = "example_total";
+  auto registry = RegisterSomeCounter(counter_name, default_metrics_path_);
+
+  const auto metrics = FetchMetrics(default_metrics_path_);
+
+  ASSERT_EQ(metrics.code, 200);
+  EXPECT_THAT(metrics.body, HasSubstr(counter_name));
+}
+
+TEST_F(IntegrationTest, exposesCountersOnDifferentUrls) {
+  const std::string first_metrics_path = "/first";
+  const std::string second_metrics_path = "/second";
+
+  const std::string first_counter_name = "first_total";
+  const std::string second_counter_name = "second_total";
+
+  const auto first_registry =
+      RegisterSomeCounter(first_counter_name, first_metrics_path);
+  const auto second_registry =
+      RegisterSomeCounter(second_counter_name, second_metrics_path);
+
+  // all set-up
+
+  const auto first_metrics = FetchMetrics(first_metrics_path);
+  const auto second_metrics = FetchMetrics(second_metrics_path);
+
+  // check results
+
+  ASSERT_EQ(first_metrics.code, 200);
+  ASSERT_EQ(second_metrics.code, 200);
+
+  EXPECT_THAT(first_metrics.body, HasSubstr(first_counter_name));
+  EXPECT_THAT(second_metrics.body, HasSubstr(second_counter_name));
+
+  EXPECT_THAT(first_metrics.body, Not(HasSubstr(second_counter_name)));
+  EXPECT_THAT(second_metrics.body, Not(HasSubstr(first_counter_name)));
+}
+
+TEST_F(IntegrationTest, unexposeRegistry) {
+  const std::string counter_name = "some_counter_total";
+  const auto registry =
+      RegisterSomeCounter(counter_name, default_metrics_path_);
+
+  exposer_->RemoveCollectable(registry, default_metrics_path_);
+
+  const auto metrics = FetchMetrics(default_metrics_path_);
+  ASSERT_EQ(metrics.code, 200);
+  EXPECT_THAT(metrics.body, Not(HasSubstr(counter_name)));
+}
+
+TEST_F(IntegrationTest, acceptOptionalCompression) {
+  const std::string counter_name = "example_total";
+  auto registry = RegisterSomeCounter(counter_name, default_metrics_path_);
+
+  fetchPrePerform_ = [](CURL* curl) {
+    curl_easy_setopt(curl, CURLOPT_ACCEPT_ENCODING, "");
+  };
+  const auto metrics = FetchMetrics(default_metrics_path_);
+
+  ASSERT_EQ(metrics.code, 200);
+  EXPECT_THAT(metrics.body, HasSubstr(counter_name));
+}
+
+TEST_F(IntegrationTest, shouldDealWithExpiredCollectables) {
+  const std::string first_counter_name = "first_total";
+  const std::string second_counter_name = "second_total";
+
+  const auto registry =
+      RegisterSomeCounter(first_counter_name, default_metrics_path_);
+  auto disappearing_registry =
+      RegisterSomeCounter(second_counter_name, default_metrics_path_);
+
+  disappearing_registry.reset();
+
+  // all set-up
+
+  const auto metrics = FetchMetrics(default_metrics_path_);
+
+  // check results
+
+  ASSERT_EQ(metrics.code, 200);
+
+  EXPECT_THAT(metrics.body, HasSubstr(first_counter_name));
+  EXPECT_THAT(metrics.body, Not(HasSubstr(second_counter_name)));
+}
+
+TEST_F(IntegrationTest, shouldSendBodyAsUtf8) {
+  const std::string counter_name = "example_total";
+  auto registry = RegisterSomeCounter(counter_name, default_metrics_path_);
+
+  const auto metrics = FetchMetrics(default_metrics_path_);
+
+  // check content type
+
+  ASSERT_EQ(metrics.code, 200);
+  EXPECT_THAT(metrics.contentType, HasSubstr("utf-8"));
+}
+
+class BasicAuthIntegrationTest : public IntegrationTest {
+ public:
+  void SetUp() override {
+    IntegrationTest::SetUp();
+
+    registry_ = RegisterSomeCounter(counter_name_, default_metrics_path_);
+
+    exposer_->RegisterAuth(
+        [&](const std::string& user, const std::string& password) {
+          return user == username_ && password == password_;
+        },
+        "Some Auth Realm", default_metrics_path_);
+  }
+
+ protected:
+  const std::string counter_name_ = "example_total";
+  const std::string username_ = "test_user";
+  const std::string password_ = "test_password";
+
+  std::shared_ptr<Registry> registry_;
+};
+
+TEST_F(BasicAuthIntegrationTest, shouldPerformProperAuthentication) {
+  fetchPrePerform_ = [&](CURL* curl) {
+    curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
+    curl_easy_setopt(curl, CURLOPT_USERNAME, username_.c_str());
+    curl_easy_setopt(curl, CURLOPT_PASSWORD, password_.c_str());
+  };
+
+  const auto metrics = FetchMetrics(default_metrics_path_);
+  ASSERT_EQ(metrics.code, 200);
+  EXPECT_THAT(metrics.body, HasSubstr(counter_name_));
+}
+
+TEST_F(BasicAuthIntegrationTest, shouldRejectRequestWithoutAuthorization) {
+  const auto metrics = FetchMetrics(default_metrics_path_);
+  ASSERT_EQ(metrics.code, 401);
+}
+
+TEST_F(BasicAuthIntegrationTest, shouldRejectRequestWithWrongUsername) {
+  fetchPrePerform_ = [&](CURL* curl) {
+    curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
+    curl_easy_setopt(curl, CURLOPT_USERNAME, "dummy");
+    curl_easy_setopt(curl, CURLOPT_PASSWORD, password_.c_str());
+  };
+
+  const auto metrics = FetchMetrics(default_metrics_path_);
+  ASSERT_EQ(metrics.code, 401);
+}
+
+TEST_F(BasicAuthIntegrationTest, shouldRejectRequestWithWrongPassword) {
+  fetchPrePerform_ = [&](CURL* curl) {
+    curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
+    curl_easy_setopt(curl, CURLOPT_USERNAME, username_.c_str());
+    curl_easy_setopt(curl, CURLOPT_PASSWORD, "dummy");
+  };
+
+  const auto metrics = FetchMetrics(default_metrics_path_);
+  ASSERT_EQ(metrics.code, 401);
+}
+
+#if defined(CURLAUTH_BEARER) && defined(CURLOPT_XOAUTH2_BEARER)
+TEST_F(BasicAuthIntegrationTest, shouldRejectWrongAuthorizationMethod) {
+  fetchPrePerform_ = [](CURL* curl) {
+    curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BEARER);
+    curl_easy_setopt(curl, CURLOPT_XOAUTH2_BEARER, "test_token");
+  };
+
+  const auto metrics = FetchMetrics(default_metrics_path_);
+  ASSERT_EQ(metrics.code, 401);
+}
+#endif
+
+TEST_F(BasicAuthIntegrationTest, shouldRejectMalformedBase64) {
+  std::unique_ptr<curl_slist, decltype(&curl_slist_free_all)> header(
+      curl_slist_append(nullptr, "Authorization: Basic $"),
+      curl_slist_free_all);
+
+  fetchPrePerform_ = [&header](CURL* curl) {
+    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, header.get());
+  };
+
+  const auto metrics = FetchMetrics(default_metrics_path_);
+  ASSERT_EQ(metrics.code, 401);
+}
+
+TEST_F(BasicAuthIntegrationTest, shouldRejectMalformedBasicAuth) {
+  std::unique_ptr<curl_slist, decltype(&curl_slist_free_all)> header(
+      curl_slist_append(nullptr, "Authorization: Basic YWJj"),
+      curl_slist_free_all);
+
+  fetchPrePerform_ = [&header](CURL* curl) {
+    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, header.get());
+  };
+
+  const auto metrics = FetchMetrics(default_metrics_path_);
+  ASSERT_EQ(metrics.code, 401);
+}
+
+}  // namespace
+}  // namespace prometheus
diff --git a/pull/tests/integration/sample_server.cc b/pull/tests/integration/sample_server.cc
index e71091b1..600958ac 100644
--- a/pull/tests/integration/sample_server.cc
+++ b/pull/tests/integration/sample_server.cc
@@ -1,41 +1,77 @@
+#include <array>
 #include <chrono>
-#include <map>
+#include <cstdlib>
 #include <memory>
 #include <string>
 #include <thread>
 
-#include <prometheus/exposer.h>
-#include <prometheus/registry.h>
+#include "prometheus/client_metric.h"
+#include "prometheus/counter.h"
+#include "prometheus/exposer.h"
+#include "prometheus/family.h"
+#include "prometheus/info.h"
+#include "prometheus/registry.h"
 
-int main(int argc, char** argv) {
+int main() {
   using namespace prometheus;
 
-  // create an http server running on port 8080
+  // create a http server running on port 8080
   Exposer exposer{"127.0.0.1:8080"};
 
-  // create a metrics registry with component=main labels applied to all its
-  // metrics
+  // create a metrics registry
+  // @note it's the users responsibility to keep the object alive
   auto registry = std::make_shared<Registry>();
 
   // add a new counter family to the registry (families combine values with the
   // same name, but distinct label dimensions)
-  auto& counter_family = BuildCounter()
-                             .Name("time_running_seconds_total")
-                             .Help("How many seconds is this server running?")
-                             .Labels({{"label", "value"}})
+  //
+  // @note please follow the metric-naming best-practices:
+  // https://prometheus.io/docs/practices/naming/
+  auto& packet_counter = BuildCounter()
+                             .Name("observed_packets_total")
+                             .Help("Number of observed packets")
                              .Register(*registry);
 
-  // add a counter to the metric family
-  auto& second_counter = counter_family.Add(
-      {{"another_label", "value"}, {"yet_another_label", "value"}});
+  // add and remember dimensional data, incrementing those is very cheap
+  auto& tcp_rx_counter =
+      packet_counter.Add({{"protocol", "tcp"}, {"direction", "rx"}});
+  auto& tcp_tx_counter =
+      packet_counter.Add({{"protocol", "tcp"}, {"direction", "tx"}});
+  auto& udp_rx_counter =
+      packet_counter.Add({{"protocol", "udp"}, {"direction", "rx"}});
+  auto& udp_tx_counter =
+      packet_counter.Add({{"protocol", "udp"}, {"direction", "tx"}});
 
-  // ask the exposer to scrape the registry on incoming scrapes
+  // add a counter whose dimensional data is not known at compile time
+  // nevertheless dimensional values should only occur in low cardinality:
+  // https://prometheus.io/docs/practices/naming/#labels
+  auto& http_requests_counter = BuildCounter()
+                                    .Name("http_requests_total")
+                                    .Help("Number of HTTP requests")
+                                    .Register(*registry);
+
+  auto& version_info = BuildInfo()
+                           .Name("versions")
+                           .Help("Static info about the library")
+                           .Register(*registry);
+  version_info.Add({{"prometheus", "1.0"}});
+  // ask the exposer to scrape the registry on incoming HTTP requests
   exposer.RegisterCollectable(registry);
 
   for (;;) {
     std::this_thread::sleep_for(std::chrono::seconds(1));
-    // increment the counter by one (second)
-    second_counter.Increment();
+    const auto random_value = std::rand();
+
+    if (random_value & 1) tcp_rx_counter.Increment();
+    if (random_value & 2) tcp_tx_counter.Increment();
+    if (random_value & 4) udp_rx_counter.Increment();
+    if (random_value & 8) udp_tx_counter.Increment();
+
+    const std::array<std::string, 4> methods = {"GET", "PUT", "POST", "HEAD"};
+    auto method = methods.at(random_value % methods.size());
+    // dynamically calling Family<T>.Add() works but is slow and should be
+    // avoided
+    http_requests_counter.Add({{"method", method}}).Increment();
   }
   return 0;
 }
diff --git a/pull/tests/integration/sample_server_auth.cc b/pull/tests/integration/sample_server_auth.cc
new file mode 100644
index 00000000..b8ff99dd
--- /dev/null
+++ b/pull/tests/integration/sample_server_auth.cc
@@ -0,0 +1,45 @@
+#include <chrono>
+#include <memory>
+#include <string>
+#include <thread>
+
+#include "prometheus/client_metric.h"
+#include "prometheus/counter.h"
+#include "prometheus/exposer.h"
+#include "prometheus/family.h"
+#include "prometheus/registry.h"
+
+int main() {
+  using namespace prometheus;
+
+  // create an http server running on port 8080
+  Exposer exposer{"127.0.0.1:8080", 1};
+
+  auto registry = std::make_shared<Registry>();
+
+  // add a new counter family to the registry (families combine values with the
+  // same name, but distinct label dimensions)
+  auto& counter_family = BuildCounter()
+                             .Name("time_running_seconds_total")
+                             .Help("How many seconds is this server running?")
+                             .Register(*registry);
+
+  // add a counter to the metric family
+  auto& seconds_counter = counter_family.Add(
+      {{"another_label", "bar"}, {"yet_another_label", "baz"}});
+
+  // ask the exposer to scrape registry on incoming scrapes for "/metrics"
+  exposer.RegisterCollectable(registry, "/metrics");
+  exposer.RegisterAuth(
+      [](const std::string& user, const std::string& password) {
+        return user == "test_user" && password == "test_password";
+      },
+      "Some Auth Realm");
+
+  for (;;) {
+    std::this_thread::sleep_for(std::chrono::seconds(1));
+    // increment the counters by one (second)
+    seconds_counter.Increment(1.0);
+  }
+  return 0;
+}
diff --git a/pull/tests/integration/sample_server_multi.cc b/pull/tests/integration/sample_server_multi.cc
new file mode 100644
index 00000000..801f1b9d
--- /dev/null
+++ b/pull/tests/integration/sample_server_multi.cc
@@ -0,0 +1,54 @@
+#include <chrono>
+#include <memory>
+#include <thread>
+
+#include "prometheus/client_metric.h"
+#include "prometheus/counter.h"
+#include "prometheus/exposer.h"
+#include "prometheus/family.h"
+#include "prometheus/registry.h"
+
+int main() {
+  using namespace prometheus;
+
+  // create an http server running on port 8080
+  Exposer exposer{"127.0.0.1:8080", 1};
+
+  auto registryA = std::make_shared<Registry>();
+
+  // add a new counter family to the registry (families combine values with the
+  // same name, but distinct label dimensions)
+  auto& counter_familyA = BuildCounter()
+                              .Name("time_running_seconds_total")
+                              .Help("How many seconds is this server running?")
+                              .Register(*registryA);
+
+  // add a counter to the metric family
+  auto& seconds_counterA = counter_familyA.Add(
+      {{"another_label", "bar"}, {"yet_another_label", "baz"}});
+
+  // ask the exposer to scrape registryA on incoming scrapes for "/metricsA"
+  exposer.RegisterCollectable(registryA, "/metricsA");
+
+  auto registryB = std::make_shared<Registry>();
+
+  auto& counter_familyB =
+      BuildCounter()
+          .Name("other_time_running_seconds_total")
+          .Help("How many seconds has something else been running?")
+          .Register(*registryB);
+
+  auto& seconds_counterB = counter_familyB.Add(
+      {{"another_label", "not_bar"}, {"yet_another_label", "not_baz"}});
+
+  // This endpoint exposes registryB.
+  exposer.RegisterCollectable(registryB, "/metricsB");
+
+  for (;;) {
+    std::this_thread::sleep_for(std::chrono::seconds(1));
+    // increment the counters by one (second)
+    seconds_counterA.Increment(1.0);
+    seconds_counterB.Increment(1.5);
+  }
+  return 0;
+}
diff --git a/pull/tests/integration/scrape.conf b/pull/tests/integration/scrape.conf
index 2acc7be5..a9581256 100644
--- a/pull/tests/integration/scrape.conf
+++ b/pull/tests/integration/scrape.conf
@@ -1,5 +1,7 @@
 [[inputs.prometheus]]
   # An array of urls to scrape metrics from.
   urls = ["http://localhost:8080/metrics"]
+  interval = '1s'
 [[outputs.file]]
   files = ["stdout"]
+  flush_interval = "1s"
diff --git a/pull/tests/integration/scrape.sh b/pull/tests/integration/scrape.sh
index 800b2513..5b1297f1 100755
--- a/pull/tests/integration/scrape.sh
+++ b/pull/tests/integration/scrape.sh
@@ -6,24 +6,14 @@ if [ ! -x "$telegraf" ] ; then
     exit 1
 fi
 
-pull/tests/integration/sample-server&
-sample_server_pid=$!
-sleep 1
-telegraf_output="$(telegraf -test -config pull/tests/integration/scrape.conf)"
-telegraf_run_result=$?
-kill -9 $sample_server_pid
+function timeout_after
+{
+   ( echo failing after $1 seconds for execution && sleep $1 && kill $$ ) &
+}
 
-if [ $telegraf_run_result -ne 0 ] ; then
-    exit $telegraf_run_result
-fi
-
-if [[ ! $telegraf_output == *"time_running_seconds_total"* ]] ; then
-   echo "Could not find time_running_seconds_total in exposed metrics:"
-   echo "${telegraf_run_output}"
-   exit 1
-fi
+trap 'kill $(jobs -p)' EXIT
 
-echo "Success:"
-echo "${telegraf_output}"
+timeout_after 10
 
-exit 0
+pull/tests/integration/sample-server &
+telegraf --config pull/tests/integration/scrape.conf --quiet | grep -m1 http_requests_total
diff --git a/pull/tests/unit/BUILD.bazel b/pull/tests/unit/BUILD.bazel
new file mode 100644
index 00000000..d84ff888
--- /dev/null
+++ b/pull/tests/unit/BUILD.bazel
@@ -0,0 +1,10 @@
+cc_test(
+    name = "unit",
+    srcs = glob(["*.cc"]),
+    copts = ["-Iexternal/googletest/include"],
+    linkstatic = True,
+    deps = [
+        "//pull",
+        "@googletest//:gtest_main",
+    ],
+)
diff --git a/pull/tests/unit/CMakeLists.txt b/pull/tests/unit/CMakeLists.txt
new file mode 100644
index 00000000..5c5c4857
--- /dev/null
+++ b/pull/tests/unit/CMakeLists.txt
@@ -0,0 +1,15 @@
+
+add_executable(prometheus_pull_test
+  exposer_test.cc
+)
+
+target_link_libraries(prometheus_pull_test
+  PRIVATE
+    ${PROJECT_NAME}::pull
+    GTest::gmock_main
+)
+
+add_test(
+  NAME prometheus_pull_test
+  COMMAND prometheus_pull_test
+)
diff --git a/pull/tests/unit/exposer_test.cc b/pull/tests/unit/exposer_test.cc
new file mode 100644
index 00000000..94c2f32d
--- /dev/null
+++ b/pull/tests/unit/exposer_test.cc
@@ -0,0 +1,25 @@
+#include "prometheus/exposer.h"
+
+#include <gtest/gtest.h>
+
+namespace prometheus {
+namespace {
+
+using namespace testing;
+
+TEST(ExposerTest, listenOnDistinctPorts) {
+  Exposer firstExposer{"0.0.0.0:0"};
+  auto firstExposerPorts = firstExposer.GetListeningPorts();
+  ASSERT_EQ(1u, firstExposerPorts.size());
+  EXPECT_NE(0, firstExposerPorts.front());
+
+  Exposer secondExposer{"0.0.0.0:0"};
+  auto secondExposerPorts = secondExposer.GetListeningPorts();
+  ASSERT_EQ(1u, secondExposerPorts.size());
+  EXPECT_NE(0, secondExposerPorts.front());
+
+  EXPECT_NE(firstExposerPorts, secondExposerPorts);
+}
+
+}  // namespace
+}  // namespace prometheus
diff --git a/push/BUILD.bazel b/push/BUILD.bazel
index 15d44c09..ca0cf812 100644
--- a/push/BUILD.bazel
+++ b/push/BUILD.bazel
@@ -1,3 +1,11 @@
+load("//bazel:export_header.bzl", "generate_dummy_export_header")
+
+generate_dummy_export_header(
+    name = "export_header",
+    basename = "PROMETHEUS_CPP_PUSH",
+    header = "include/prometheus/detail/push_export.h",
+)
+
 cc_library(
     name = "push",
     srcs = glob([
@@ -6,16 +14,29 @@ cc_library(
     ]),
     hdrs = glob(
         ["include/**/*.h"],
-    ),
+    ) + [":export_header"],
     linkopts = select({
-        "//:windows": [],
-        "//:windows_msvc": [],
+        "@platforms//os:windows": [],
         "//conditions:default": ["-lpthread"],
     }),
     strip_include_prefix = "include",
     visibility = ["//visibility:public"],
     deps = [
         "//core",
-        "@com_github_curl//:curl",
+        "//util",
+        "@curl",
+    ],
+)
+
+cc_library(
+    name = "push_internal_headers",
+    hdrs = glob(
+        ["src/detail/*.h"],
+    ),
+    strip_include_prefix = "src",
+    visibility = ["//push/tests:__subpackages__"],
+    deps = [
+        "//core",
+        "//push",
     ],
 )
diff --git a/push/CMakeLists.txt b/push/CMakeLists.txt
index 4e4002e2..19f22e1f 100644
--- a/push/CMakeLists.txt
+++ b/push/CMakeLists.txt
@@ -3,27 +3,48 @@ find_package(CURL REQUIRED)
 
 add_library(push
   src/gateway.cc
+
+  src/detail/curl_wrapper.cc
+  src/detail/curl_wrapper.h
+  src/detail/label_encoder.cc
+  src/detail/label_encoder.h
 )
 
 add_library(${PROJECT_NAME}::push ALIAS push)
 
+target_compile_features(push
+  PUBLIC
+    cxx_std_11
+)
+
 target_link_libraries(push
   PUBLIC
     ${PROJECT_NAME}::core
+    CURL::libcurl
   PRIVATE
+    ${PROJECT_NAME}::util
     Threads::Threads
-    ${CURL_LIBRARIES}
-    $<$<AND:$<BOOL:UNIX>,$<NOT:$<BOOL:APPLE>>>:rt>
+    $<$<AND:$<BOOL:${UNIX}>,$<NOT:$<BOOL:${APPLE}>>>:rt>
 )
 
 target_include_directories(push
   PUBLIC
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
-  PRIVATE
-    ${CURL_INCLUDE_DIRS}
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>
+)
+
+set_target_properties(push
+  PROPERTIES
+    OUTPUT_NAME ${PROJECT_NAME}-push
+    DEFINE_SYMBOL PROMETHEUS_CPP_PUSH_EXPORTS
+    VERSION "${PROJECT_VERSION}"
+    SOVERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}"
 )
 
-set_target_properties(push PROPERTIES OUTPUT_NAME ${PROJECT_NAME}-push)
+generate_export_header(push
+  BASE_NAME ${PROJECT_NAME}-push
+  EXPORT_FILE_NAME include/prometheus/detail/push_export.h
+)
 
 install(
   TARGETS push
@@ -35,10 +56,36 @@ install(
 )
 
 install(
-  DIRECTORY include/
+  DIRECTORY include/ ${CMAKE_CURRENT_BINARY_DIR}/include/
   DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )
 
+if(GENERATE_PKGCONFIG)
+  set(PKGCONFIG_LIBS)
+  set(PKGCONFIG_REQUIRES)
+
+  string(APPEND PKGCONFIG_REQUIRES " libcurl")
+
+  configure_file(
+    ${PROJECT_SOURCE_DIR}/cmake/prometheus-cpp-push.pc.in
+    ${CMAKE_CURRENT_BINARY_DIR}/prometheus-cpp-push.pc
+    @ONLY
+  )
+
+  install(
+    FILES ${CMAKE_CURRENT_BINARY_DIR}/prometheus-cpp-push.pc
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
+  )
+
+  unset(PKGCONFIG_LIBS)
+  unset(PKGCONFIG_REQUIRES)
+endif()
+
 if(ENABLE_TESTING)
+  add_library(push_internal_headers INTERFACE)
+  add_library(${PROJECT_NAME}::push_internal_headers ALIAS push_internal_headers)
+  target_include_directories(push_internal_headers INTERFACE src)
+  target_link_libraries(push_internal_headers INTERFACE ${PROJECT_NAME}::push)
+
   add_subdirectory(tests)
 endif()
diff --git a/push/include/prometheus/detail/http_method.h b/push/include/prometheus/detail/http_method.h
new file mode 100644
index 00000000..21eb1820
--- /dev/null
+++ b/push/include/prometheus/detail/http_method.h
@@ -0,0 +1,12 @@
+#pragma once
+
+namespace prometheus {
+namespace detail {
+enum class HttpMethod {
+  Post,
+  Put,
+  Delete,
+};
+
+}  // namespace detail
+}  // namespace prometheus
diff --git a/push/include/prometheus/gateway.h b/push/include/prometheus/gateway.h
index 295116d5..40c1f996 100644
--- a/push/include/prometheus/gateway.h
+++ b/push/include/prometheus/gateway.h
@@ -1,45 +1,64 @@
 #pragma once
 
+#include <curl/curl.h>
+
+#include <chrono>
+#include <functional>
 #include <future>
-#include <map>
 #include <memory>
-#include <sstream>
+#include <mutex>
 #include <string>
+#include <utility>
 #include <vector>
 
-#include "prometheus/registry.h"
+#include "prometheus/collectable.h"
+#include "prometheus/detail/http_method.h"
+#include "prometheus/detail/push_export.h"
+#include "prometheus/labels.h"
+
 
 namespace prometheus {
 
-class Gateway {
+namespace detail {
+class CurlWrapper;
+}
+
+class PROMETHEUS_CPP_PUSH_EXPORT Gateway {
  public:
-  using Labels = std::map<std::string, std::string>;
+  Gateway(const std::string& host, const std::string& port,
+          const std::string& jobname, const Labels& labels = {},
+          const std::string& username = {}, const std::string& password = {},
+          std::chrono::seconds timeout = {});
+
+  Gateway(const std::string& host, const std::string& port,
+          std::function<void(CURL*)> presetupCurl, const std::string& jobname,
+          const Labels& labels = {});
+
+  Gateway(const std::string& url,
+          std::function<void(CURL*)> presetupCurl, const std::string& jobname,
+          const Labels& labels = {});
+
+  Gateway(const Gateway&) = delete;
+  Gateway(Gateway&&) = delete;
+  Gateway& operator=(const Gateway&) = delete;
+  Gateway& operator=(Gateway&&) = delete;
 
-  Gateway(const std::string& uri, const std::string jobname,
-          const Labels& labels = {}, const std::string username = {},
-          const std::string password = {});
   ~Gateway();
 
   void RegisterCollectable(const std::weak_ptr<Collectable>& collectable,
                            const Labels* labels = nullptr);
 
-  static const Labels GetInstanceLabel(std::string hostname);
-
-  enum class HttpMethod {
-    Post,
-    Put,
-    Delete,
-  };
+  static Labels GetInstanceLabel(std::string hostname);
 
   // Push metrics to the given pushgateway.
-  int Push() { return push(HttpMethod::Post); }
+  int Push();
 
-  std::future<int> AsyncPush() { return async_push(HttpMethod::Post); }
+  std::future<int> AsyncPush();
 
   // PushAdd metrics to the given pushgateway.
-  int PushAdd() { return push(HttpMethod::Put); }
+  int PushAdd();
 
-  std::future<int> AsyncPushAdd() { return async_push(HttpMethod::Put); }
+  std::future<int> AsyncPushAdd();
 
   // Delete metrics from the given pushgateway.
   int Delete();
@@ -47,22 +66,34 @@ class Gateway {
   // Delete metrics from the given pushgateway.
   std::future<int> AsyncDelete();
 
+  // Delete metrics from the given pushgateway (for configured instance labels).
+  int DeleteForInstance();
+
+  // Delete metrics from the given pushgateway (for configured instance labels).
+  std::future<int> AsyncDeleteForInstance();
+
+  /// \brief Add a custom HTTP header.
+  ///
+  /// \param header custom header in the form "key:value".
+  /// \return true on success, otherwise false
+  bool AddHttpHeader(const std::string& header);
+
  private:
   std::string jobUri_;
   std::string labels_;
-  std::string auth_;
+  std::unique_ptr<detail::CurlWrapper> curlWrapper_;
+  std::mutex mutex_;
 
   using CollectableEntry = std::pair<std::weak_ptr<Collectable>, std::string>;
   std::vector<CollectableEntry> collectables_;
 
   std::string getUri(const CollectableEntry& collectable) const;
 
-  int performHttpRequest(HttpMethod method, const std::string& uri,
-                         const std::string& body) const;
+  int push(detail::HttpMethod method);
 
-  int push(HttpMethod method);
+  std::future<int> async_push(detail::HttpMethod method);
 
-  std::future<int> async_push(HttpMethod method);
+  static void CleanupStalePointers(std::vector<CollectableEntry>& collectables);
 };
 
 }  // namespace prometheus
diff --git a/push/src/detail/curl_wrapper.cc b/push/src/detail/curl_wrapper.cc
new file mode 100644
index 00000000..997c3745
--- /dev/null
+++ b/push/src/detail/curl_wrapper.cc
@@ -0,0 +1,102 @@
+#include "curl_wrapper.h"
+
+#include <stdexcept>
+
+namespace prometheus {
+namespace detail {
+
+static const char CONTENT_TYPE[] =
+    "Content-Type: text/plain; version=0.0.4; charset=utf-8";
+
+CurlWrapper::CurlWrapper(std::function<void(CURL*)> presetupCurl)
+    : presetupCurl_(presetupCurl) {
+  /* In windows, this will init the winsock stuff */
+  auto error = curl_global_init(CURL_GLOBAL_ALL);
+  if (error) {
+    throw std::runtime_error("Cannot initialize global curl!");
+  }
+
+  curl_ = curl_easy_init();
+  if (!curl_) {
+    curl_global_cleanup();
+    throw std::runtime_error("Cannot initialize easy curl!");
+  }
+
+  if (presetupCurl_) {
+    presetupCurl_(curl_);  
+  }
+
+  optHttpHeader_ = curl_slist_append(nullptr, CONTENT_TYPE);
+  if (!optHttpHeader_) {
+    throw std::runtime_error("Cannot append the header of the content type");
+  }
+}
+
+CurlWrapper::~CurlWrapper() {
+  curl_slist_free_all(optHttpHeader_);
+  curl_easy_cleanup(curl_);
+  curl_global_cleanup();
+}
+
+int CurlWrapper::performHttpRequest(HttpMethod method, const std::string& uri,
+                                    const std::string& body) {
+  std::lock_guard<std::mutex> l(mutex_);
+
+  curl_easy_reset(curl_);
+  curl_easy_setopt(curl_, CURLOPT_URL, uri.c_str());
+
+  curl_easy_setopt(curl_, CURLOPT_HTTPHEADER, optHttpHeader_);
+
+  if (presetupCurl_) {
+    presetupCurl_(curl_);  
+  }
+
+  if (!body.empty()) {
+    curl_easy_setopt(curl_, CURLOPT_POSTFIELDSIZE, body.size());
+    curl_easy_setopt(curl_, CURLOPT_POSTFIELDS, body.data());
+  } else {
+    curl_easy_setopt(curl_, CURLOPT_POSTFIELDSIZE, 0L);
+  }
+
+  switch (method) {
+    case HttpMethod::Post:
+      curl_easy_setopt(curl_, CURLOPT_POST, 1L);
+      break;
+
+    case HttpMethod::Put:
+      curl_easy_setopt(curl_, CURLOPT_NOBODY, 0L);
+      curl_easy_setopt(curl_, CURLOPT_CUSTOMREQUEST, "PUT");
+      break;
+
+    case HttpMethod::Delete:
+      curl_easy_setopt(curl_, CURLOPT_HTTPGET, 0L);
+      curl_easy_setopt(curl_, CURLOPT_NOBODY, 0L);
+      curl_easy_setopt(curl_, CURLOPT_CUSTOMREQUEST, "DELETE");
+      break;
+  }
+
+  auto curl_error = curl_easy_perform(curl_);
+
+  long response_code;
+  curl_easy_getinfo(curl_, CURLINFO_RESPONSE_CODE, &response_code);
+
+  if (curl_error != CURLE_OK) {
+    return -curl_error;
+  }
+
+  return response_code;
+}
+
+bool CurlWrapper::addHttpHeader(const std::string& header) {
+  std::lock_guard<std::mutex> lock{mutex_};
+  auto updated_header = curl_slist_append(optHttpHeader_, header.c_str());
+  if (!updated_header) {
+    return false;
+  }
+
+  optHttpHeader_ = updated_header;
+  return true;
+}
+
+}  // namespace detail
+}  // namespace prometheus
diff --git a/push/src/detail/curl_wrapper.h b/push/src/detail/curl_wrapper.h
new file mode 100644
index 00000000..69c6d6a1
--- /dev/null
+++ b/push/src/detail/curl_wrapper.h
@@ -0,0 +1,35 @@
+#include <curl/curl.h>
+
+#include <functional>
+#include <mutex>
+#include <string>
+
+#include "prometheus/detail/http_method.h"
+
+namespace prometheus {
+namespace detail {
+
+class CurlWrapper {
+ public:
+  CurlWrapper(std::function<void(CURL*)> presetupCurl);
+
+  CurlWrapper(const CurlWrapper&) = delete;
+  CurlWrapper(CurlWrapper&&) = delete;
+  CurlWrapper& operator=(const CurlWrapper&) = delete;
+  CurlWrapper& operator=(CurlWrapper&&) = delete;
+
+  ~CurlWrapper();
+
+  int performHttpRequest(HttpMethod method, const std::string& uri,
+                         const std::string& body = {});
+  bool addHttpHeader(const std::string& header);
+
+ private:
+  CURL* curl_;
+  std::mutex mutex_;
+  curl_slist* optHttpHeader_;
+  std::function<void(CURL*)> presetupCurl_;
+};
+
+}  // namespace detail
+}  // namespace prometheus
diff --git a/push/src/detail/label_encoder.cc b/push/src/detail/label_encoder.cc
new file mode 100644
index 00000000..75a6fc11
--- /dev/null
+++ b/push/src/detail/label_encoder.cc
@@ -0,0 +1,42 @@
+#include "label_encoder.h"
+
+#include <algorithm>
+#include <ostream>
+
+#include "prometheus/detail/base64.h"
+
+namespace prometheus {
+namespace detail {
+
+namespace {
+// Does this character need encoding like in RFC 3986 section 2.3?
+bool needsEncoding(char c) {
+  if (c >= 'a' && c <= 'z') {
+    return false;
+  }
+  if (c >= 'A' && c <= 'Z') {
+    return false;
+  }
+  if (c >= '0' && c <= '9') {
+    return false;
+  }
+  if (c == '-' || c == '.' || c == '_' || c == '~') {
+    return false;
+  }
+  return true;
+}
+}  // namespace
+
+void encodeLabel(std::ostream& os, const Label& label) {
+  if (label.second.empty()) {
+    os << "/" << label.first << "@base64/=";
+  } else if (std::any_of(label.second.begin(), label.second.end(),
+                         needsEncoding)) {
+    os << "/" << label.first << "@base64/"
+       << detail::base64url_encode(label.second);
+  } else {
+    os << "/" << label.first << "/" << label.second;
+  }
+}
+}  // namespace detail
+}  // namespace prometheus
diff --git a/push/src/detail/label_encoder.h b/push/src/detail/label_encoder.h
new file mode 100644
index 00000000..2713f7ee
--- /dev/null
+++ b/push/src/detail/label_encoder.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <iosfwd>
+
+#include "prometheus/labels.h"
+#include "prometheus/detail/push_export.h"
+
+namespace prometheus {
+namespace detail {
+
+PROMETHEUS_CPP_PUSH_EXPORT void encodeLabel(std::ostream& os, const Label& label);
+
+}
+}  // namespace prometheus
\ No newline at end of file
diff --git a/push/src/gateway.cc b/push/src/gateway.cc
index b0f08ca3..85044136 100644
--- a/push/src/gateway.cc
+++ b/push/src/gateway.cc
@@ -1,45 +1,95 @@
 
 #include "prometheus/gateway.h"
 
-#include "prometheus/client_metric.h"
-#include "prometheus/serializer.h"
+#include <algorithm>
+#include <iterator>
+#include <map>
+#include <memory>
+#include <mutex>
+#include <sstream>
+
+#include "detail/curl_wrapper.h"
+#include "detail/label_encoder.h"
+#include "prometheus/detail/future_std.h"
+#include "prometheus/metric_family.h"  // IWYU pragma: keep
 #include "prometheus/text_serializer.h"
 
-#include <curl/curl.h>
+// IWYU pragma: no_include <system_error>
+// IWYU pragma: no_include <cxxabi.h>
 
 namespace prometheus {
 
-static const char CONTENT_TYPE[] =
-    "Content-Type: text/plain; version=0.0.4; charset=utf-8";
+namespace {
+class SetupAdapter {
+ public:
+  SetupAdapter(const std::string& username, const std::string& password,
+               std::chrono::seconds timeout)
+      : timeout_(timeout) {
+    if (!username.empty()) {
+      auth_ = username + ":" + password;
+    }
+  }
 
-Gateway::Gateway(const std::string& uri, const std::string jobname,
-                 const Labels& labels, const std::string username,
-                 const std::string password) {
-  /* In windows, this will init the winsock stuff */
-  curl_global_init(CURL_GLOBAL_ALL);
+  void operator()(CURL* curl) {
+    if (!auth_.empty()) {
+      curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
+      curl_easy_setopt(curl, CURLOPT_USERPWD, auth_.c_str());
+    }
+    curl_easy_setopt(curl, CURLOPT_TIMEOUT, timeout_);
+  }
 
-  std::stringstream jobUriStream;
-  jobUriStream << uri << "/metrics/job/" << jobname;
-  jobUri_ = jobUriStream.str();
+ private:
+  std::string auth_;
+  std::chrono::seconds timeout_;
+};
+
+std::string concatenate(const std::string& host, const std::string& port) {
+  std::stringstream ss;
+  ss << host << ":" << port;
+  return ss.str();
+}
+}  // namespace
+
+Gateway::Gateway(const std::string& host, const std::string& port,
+                 const std::string& jobname, const Labels& labels,
+                 const std::string& username, const std::string& password,
+                 std::chrono::seconds timeout)
+    : Gateway(host, port, SetupAdapter{username, password, timeout}, jobname,
+              labels) {}
+
+Gateway::Gateway(const std::string& host, const std::string& port,
+                 std::function<void(CURL*)> presetupCurl,
+                 const std::string& jobname, const Labels& labels)
+    : Gateway(concatenate(host, port), presetupCurl, jobname, labels) {}
+
+Gateway::Gateway(const std::string& url,
+                 std::function<void(CURL*)> presetupCurl,
+                 const std::string& jobname, const Labels& labels) {
+  curlWrapper_ = detail::make_unique<detail::CurlWrapper>(presetupCurl);
 
-  if (!username.empty()) {
-    auth_ = username + ":" + password;
+  std::stringstream jobUriStream;
+  jobUriStream << url;
+  if (!url.empty() && url.back() != '/') {
+    jobUriStream << "/";
   }
+  jobUriStream << "metrics";
+  detail::encodeLabel(jobUriStream, {"job", jobname});
+  jobUri_ = jobUriStream.str();
 
   std::stringstream labelStream;
   for (auto& label : labels) {
-    labelStream << "/" << label.first << "/" << label.second;
+    detail::encodeLabel(labelStream, label);
   }
   labels_ = labelStream.str();
 }
 
-Gateway::~Gateway() { curl_global_cleanup(); }
+Gateway::~Gateway() = default;
 
-const Gateway::Labels Gateway::GetInstanceLabel(std::string hostname) {
+Labels Gateway::GetInstanceLabel(std::string hostname) {
   if (hostname.empty()) {
-    return Gateway::Labels{};
+    return Labels{};
   }
-  return Gateway::Labels{{"instance", hostname}};
+  return Labels{{"instance", hostname}};
 }
 
 void Gateway::RegisterCollectable(const std::weak_ptr<Collectable>& collectable,
@@ -48,68 +98,13 @@ void Gateway::RegisterCollectable(const std::weak_ptr<Collectable>& collectable,
 
   if (labels) {
     for (auto& label : *labels) {
-      ss << "/" << label.first << "/" << label.second;
+      detail::encodeLabel(ss, label);
     }
   }
 
-  collectables_.push_back(std::make_pair(collectable, ss.str()));
-}
-
-int Gateway::performHttpRequest(HttpMethod method, const std::string& uri,
-                                const std::string& body) const {
-  auto curl = curl_easy_init();
-  if (!curl) {
-    return -CURLE_FAILED_INIT;
-  }
-
-  curl_easy_setopt(curl, CURLOPT_URL, uri.c_str());
-
-  curl_slist* header_chunk = nullptr;
-
-  if (!body.empty()) {
-    header_chunk = curl_slist_append(nullptr, CONTENT_TYPE);
-    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, header_chunk);
-
-    curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, body.size());
-    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, body.data());
-  }
-
-  if (!auth_.empty()) {
-    curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
-    curl_easy_setopt(curl, CURLOPT_USERPWD, auth_.c_str());
-  }
-
-  switch (method) {
-    case HttpMethod::Post:
-      curl_easy_setopt(curl, CURLOPT_HTTPGET, 0L);
-      curl_easy_setopt(curl, CURLOPT_NOBODY, 0L);
-      break;
-
-    case HttpMethod::Put:
-      curl_easy_setopt(curl, CURLOPT_NOBODY, 0L);
-      curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "PUT");
-      break;
-
-    case HttpMethod::Delete:
-      curl_easy_setopt(curl, CURLOPT_HTTPGET, 0L);
-      curl_easy_setopt(curl, CURLOPT_NOBODY, 0L);
-      curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "DELETE");
-      break;
-  }
-
-  auto curl_error = curl_easy_perform(curl);
-
-  long response_code;
-  curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
-
-  curl_easy_cleanup(curl);
-  curl_slist_free_all(header_chunk);
-
-  if (curl_error != CURLE_OK) {
-    return -curl_error;
-  }
-
-  return response_code;
+  std::lock_guard<std::mutex> lock{mutex_};
+  CleanupStalePointers(collectables_);
+  collectables_.emplace_back(collectable, ss.str());
 }
 
 std::string Gateway::getUri(const CollectableEntry& collectable) const {
@@ -119,9 +114,14 @@ std::string Gateway::getUri(const CollectableEntry& collectable) const {
   return uri.str();
 }
 
-int Gateway::push(HttpMethod method) {
+int Gateway::Push() { return push(detail::HttpMethod::Post); }
+
+int Gateway::PushAdd() { return push(detail::HttpMethod::Put); }
+
+int Gateway::push(detail::HttpMethod method) {
   const auto serializer = TextSerializer{};
 
+  std::lock_guard<std::mutex> lock{mutex_};
   for (auto& wcollectable : collectables_) {
     auto collectable = wcollectable.first.lock();
     if (!collectable) {
@@ -131,9 +131,9 @@ int Gateway::push(HttpMethod method) {
     auto metrics = collectable->Collect();
     auto body = serializer.Serialize(metrics);
     auto uri = getUri(wcollectable);
-    auto status_code = performHttpRequest(method, uri, body);
+    auto status_code = curlWrapper_->performHttpRequest(method, uri, body);
 
-    if (status_code >= 400) {
+    if (status_code < 100 || status_code >= 400) {
       return status_code;
     }
   }
@@ -141,10 +141,19 @@ int Gateway::push(HttpMethod method) {
   return 200;
 }
 
-std::future<int> Gateway::async_push(HttpMethod method) {
+std::future<int> Gateway::AsyncPush() {
+  return async_push(detail::HttpMethod::Post);
+}
+
+std::future<int> Gateway::AsyncPushAdd() {
+  return async_push(detail::HttpMethod::Put);
+}
+
+std::future<int> Gateway::async_push(detail::HttpMethod method) {
   const auto serializer = TextSerializer{};
   std::vector<std::future<int>> futures;
 
+  std::lock_guard<std::mutex> lock{mutex_};
   for (auto& wcollectable : collectables_) {
     auto collectable = wcollectable.first.lock();
     if (!collectable) {
@@ -152,37 +161,60 @@ std::future<int> Gateway::async_push(HttpMethod method) {
     }
 
     auto metrics = collectable->Collect();
-    auto body = serializer.Serialize(metrics);
+    auto body = std::make_shared<std::string>(serializer.Serialize(metrics));
     auto uri = getUri(wcollectable);
 
-    futures.push_back(std::async(std::launch::async, [&] {
-      return performHttpRequest(method, uri, body);
+    futures.push_back(std::async(std::launch::async, [method, uri, body, this] {
+      return curlWrapper_->performHttpRequest(method, uri, *body);
     }));
   }
 
-  return std::async(std::launch::async, [&] {
+  const auto reduceFutures = [](std::vector<std::future<int>> lfutures) {
     auto final_status_code = 200;
 
-    for (auto& future : futures) {
+    for (auto& future : lfutures) {
       auto status_code = future.get();
 
-      if (status_code >= 400) {
+      if (status_code < 100 || status_code >= 400) {
         final_status_code = status_code;
       }
     }
 
     return final_status_code;
-  });
+  };
+
+  return std::async(std::launch::async, reduceFutures, std::move(futures));
 }
 
 int Gateway::Delete() {
-  return performHttpRequest(HttpMethod::Delete, jobUri_, {});
+  return curlWrapper_->performHttpRequest(detail::HttpMethod::Delete, jobUri_);
 }
 
 std::future<int> Gateway::AsyncDelete() {
-  return std::async(std::launch::async, [&] {
-    return Delete();
-  });
+  return std::async(std::launch::async, [&] { return Delete(); });
+}
+
+int Gateway::DeleteForInstance() {
+  return curlWrapper_->performHttpRequest(detail::HttpMethod::Delete,
+                                          jobUri_ + labels_);
+}
+
+std::future<int> Gateway::AsyncDeleteForInstance() {
+  return std::async(std::launch::async, [&] { return DeleteForInstance(); });
+}
+
+void Gateway::CleanupStalePointers(
+    std::vector<CollectableEntry>& collectables) {
+  collectables.erase(
+      std::remove_if(std::begin(collectables), std::end(collectables),
+                     [](const CollectableEntry& candidate) {
+                       return candidate.first.expired();
+                     }),
+      std::end(collectables));
+}
+
+bool Gateway::AddHttpHeader(const std::string& header) {
+  return curlWrapper_->addHttpHeader(header);
 }
 
 }  // namespace prometheus
diff --git a/push/tests/CMakeLists.txt b/push/tests/CMakeLists.txt
index 26e40e61..52b0f4f6 100644
--- a/push/tests/CMakeLists.txt
+++ b/push/tests/CMakeLists.txt
@@ -1 +1,2 @@
 add_subdirectory(integration)
+add_subdirectory(internal)
diff --git a/push/tests/integration/CMakeLists.txt b/push/tests/integration/CMakeLists.txt
index 3af6856e..a2e7a3f7 100644
--- a/push/tests/integration/CMakeLists.txt
+++ b/push/tests/integration/CMakeLists.txt
@@ -6,4 +6,5 @@ add_executable(sample_client
 target_link_libraries(sample_client
   PRIVATE
     ${PROJECT_NAME}::push
+    $<$<BOOL:${WIN32}>:Ws2_32>
 )
diff --git a/push/tests/integration/sample_client.cc b/push/tests/integration/sample_client.cc
index aa8442f3..fac5e017 100644
--- a/push/tests/integration/sample_client.cc
+++ b/push/tests/integration/sample_client.cc
@@ -1,16 +1,18 @@
 #include <chrono>
-#include <map>
+#include <iostream>
 #include <memory>
 #include <string>
 #include <thread>
 
-#include <prometheus/gateway.h>
-#include <prometheus/registry.h>
+#include "prometheus/client_metric.h"
+#include "prometheus/counter.h"
+#include "prometheus/family.h"
+#include "prometheus/gateway.h"
+#include "prometheus/registry.h"
 
 #ifdef _WIN32
 #include <Winsock2.h>
 #else
-#include <sys/param.h>
 #include <unistd.h>
 #endif
 
@@ -23,13 +25,13 @@ static std::string GetHostName() {
   return hostname;
 }
 
-int main(int argc, char** argv) {
+int main() {
   using namespace prometheus;
 
   // create a push gateway
   const auto labels = Gateway::GetInstanceLabel(GetHostName());
 
-  Gateway gateway{"127.0.0.1:9091", "sample_client", labels};
+  Gateway gateway{"127.0.0.1", "9091", "sample_client", labels};
 
   // create a metrics registry with component=main labels applied to all its
   // metrics
@@ -50,13 +52,17 @@ int main(int argc, char** argv) {
   // ask the pusher to push the metrics to the pushgateway
   gateway.RegisterCollectable(registry);
 
+  // add custom HTTP header
+  gateway.AddHttpHeader("Foo:foo");
+
   for (;;) {
     std::this_thread::sleep_for(std::chrono::seconds(1));
     // increment the counter by one (second)
     second_counter.Increment();
 
     // push metrics
-    gateway.Push();
+    auto returnCode = gateway.Push();
+    std::cout << "returnCode is " << returnCode << std::endl;
   }
   return 0;
 }
diff --git a/push/tests/internal/BUILD.bazel b/push/tests/internal/BUILD.bazel
new file mode 100644
index 00000000..cfb403fc
--- /dev/null
+++ b/push/tests/internal/BUILD.bazel
@@ -0,0 +1,10 @@
+cc_test(
+    name = "internal",
+    srcs = glob(["*.cc"]),
+    copts = ["-Iexternal/googletest/include"],
+    linkstatic = True,
+    deps = [
+        "//push:push_internal_headers",
+        "@googletest//:gtest_main",
+    ],
+)
diff --git a/push/tests/internal/CMakeLists.txt b/push/tests/internal/CMakeLists.txt
new file mode 100644
index 00000000..f505cf6f
--- /dev/null
+++ b/push/tests/internal/CMakeLists.txt
@@ -0,0 +1,14 @@
+add_executable(prometheus_push_internal_test
+  label_encoder_test.cc
+)
+
+target_link_libraries(prometheus_push_internal_test
+  PRIVATE
+    ${PROJECT_NAME}::push_internal_headers
+    GTest::gmock_main
+)
+
+add_test(
+  NAME prometheus_push_internal_test
+  COMMAND prometheus_push_internal_test
+)
diff --git a/push/tests/internal/label_encoder_test.cc b/push/tests/internal/label_encoder_test.cc
new file mode 100644
index 00000000..4aa722ce
--- /dev/null
+++ b/push/tests/internal/label_encoder_test.cc
@@ -0,0 +1,43 @@
+#include "detail/label_encoder.h"
+
+#include <gtest/gtest.h>
+
+#include <sstream>
+#include <string>
+
+namespace prometheus {
+namespace {
+
+class LabelEncoderTest : public testing::Test {
+ protected:
+  std::string Encode(const Label& label) {
+    std::stringstream ss;
+    detail::encodeLabel(ss, label);
+    return ss.str();
+  }
+};
+
+// test cases taken from https://github.com/prometheus/pushgateway#url
+
+TEST_F(LabelEncoderTest, regular) {
+  EXPECT_EQ("/foo/bar", Encode(Label{"foo", "bar"}));
+}
+
+TEST_F(LabelEncoderTest, empty) {
+  EXPECT_EQ("/first_label@base64/=", Encode(Label{"first_label", ""}));
+}
+
+TEST_F(LabelEncoderTest, path) {
+  EXPECT_EQ("/path@base64/L3Zhci90bXA=", Encode(Label{"path", "/var/tmp"}));
+}
+
+TEST_F(LabelEncoderTest, unicode) {
+  const char unicodeText[] =
+      "\xce\xa0\xcf\x81\xce\xbf\xce\xbc\xce\xb7\xce\xb8\xce\xb5\xcf\x8d\xcf"
+      "\x82";  // Προμηθεύς
+  EXPECT_EQ("/name@base64/zqDPgc6_zrzOt864zrXPjc-C",
+            Encode(Label{"name", unicodeText}));
+}
+
+}  // namespace
+}  // namespace prometheus
diff --git a/repositories.bzl b/repositories.bzl
deleted file mode 100644
index 8696657b..00000000
--- a/repositories.bzl
+++ /dev/null
@@ -1,63 +0,0 @@
-load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
-
-def load_civetweb():
-    http_archive(
-        name = "civetweb",
-        strip_prefix = "civetweb-1.11",
-        sha256 = "de7d5e7a2d9551d325898c71e41d437d5f7b51e754b242af897f7be96e713a42",
-        urls = [
-            "https://github.com/civetweb/civetweb/archive/v1.11.tar.gz",
-        ],
-        build_file = "@com_github_jupp0r_prometheus_cpp//bazel:civetweb.BUILD",
-    )
-
-def load_com_google_googletest():
-    http_archive(
-        name = "com_google_googletest",
-        sha256 = "9bf1fe5182a604b4135edc1a425ae356c9ad15e9b23f9f12a02e80184c3a249c",
-        strip_prefix = "googletest-release-1.8.1",
-        urls = [
-            "https://github.com/google/googletest/archive/release-1.8.1.tar.gz",
-        ],
-    )
-
-def load_com_github_curl():
-    http_archive(
-        name = "com_github_curl",
-        sha256 = "e9c37986337743f37fd14fe8737f246e97aec94b39d1b71e8a5973f72a9fc4f5",
-        strip_prefix = "curl-7.60.0",
-        urls = [
-            "https://mirror.bazel.build/curl.haxx.se/download/curl-7.60.0.tar.gz",
-            "https://curl.haxx.se/download/curl-7.60.0.tar.gz",
-        ],
-        build_file = "@com_github_jupp0r_prometheus_cpp//bazel:curl.BUILD",
-    )
-
-def load_com_github_google_benchmark():
-    http_archive(
-        name = "com_github_google_benchmark",
-        sha256 = "f8e525db3c42efc9c7f3bc5176a8fa893a9a9920bbd08cef30fb56a51854d60d",
-        strip_prefix = "benchmark-1.4.1",
-        urls = [
-            "https://github.com/google/benchmark/archive/v1.4.1.tar.gz",
-        ],
-    )
-
-def load_net_zlib_zlib():
-    http_archive(
-        name = "net_zlib_zlib",
-        sha256 = "c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1",
-        strip_prefix = "zlib-1.2.11",
-        urls = [
-            "https://mirror.bazel.build/zlib.net/zlib-1.2.11.tar.gz",
-            "https://zlib.net/zlib-1.2.11.tar.gz",
-        ],
-        build_file = "@com_github_jupp0r_prometheus_cpp//bazel:zlib.BUILD",
-    )
-
-def prometheus_cpp_repositories():
-    if "civetweb" not in native.existing_rules(): load_civetweb()
-    if "com_google_googletest" not in native.existing_rules(): load_com_google_googletest()
-    if "com_github_google_benchmark" not in native.existing_rules(): load_com_github_google_benchmark()
-    if "com_github_curl" not in native.existing_rules(): load_com_github_curl()
-    if "net_zlib_zlib" not in native.existing_rules(): load_net_zlib_zlib()
diff --git a/util/BUILD.bazel b/util/BUILD.bazel
new file mode 100644
index 00000000..e9e8a31a
--- /dev/null
+++ b/util/BUILD.bazel
@@ -0,0 +1,6 @@
+cc_library(
+    name = "util",
+    hdrs = glob(["include/**/*.h"]),
+    strip_include_prefix = "include",
+    visibility = ["//:__subpackages__"],
+)
diff --git a/util/CMakeLists.txt b/util/CMakeLists.txt
new file mode 100644
index 00000000..971375e4
--- /dev/null
+++ b/util/CMakeLists.txt
@@ -0,0 +1,25 @@
+add_library(util INTERFACE)
+
+add_library(${PROJECT_NAME}::util ALIAS util)
+
+target_compile_features(util
+  INTERFACE
+    cxx_std_11
+)
+
+target_include_directories(util
+  INTERFACE
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+)
+
+install(
+  TARGETS util
+  EXPORT ${PROJECT_NAME}-targets
+  RUNTIME DESTINATION  ${CMAKE_INSTALL_BINDIR}
+  LIBRARY DESTINATION  ${CMAKE_INSTALL_LIBDIR}
+  ARCHIVE DESTINATION  ${CMAKE_INSTALL_LIBDIR}
+)
+
+if(ENABLE_TESTING)
+  add_subdirectory(tests)
+endif()
diff --git a/util/include/prometheus/detail/base64.h b/util/include/prometheus/detail/base64.h
new file mode 100644
index 00000000..ebd71103
--- /dev/null
+++ b/util/include/prometheus/detail/base64.h
@@ -0,0 +1,140 @@
+#pragma once
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <stdexcept>
+#include <string>
+
+namespace prometheus {
+namespace detail {
+
+/*
+Copyright (C) 2019-2020 by Martin Vorbrodt <martin@vorbrodt.blog>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
+
+https://github.com/mvorbrodt/blog/blob/master/src/base64.hpp
+*/
+
+static constexpr char kEncodeLookup[] =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+static constexpr char kPadCharacter = '=';
+
+inline std::string base64_encode(const std::string& input) {
+  std::string encoded;
+  encoded.reserve(((input.size() / 3) + (input.size() % 3 > 0)) * 4);
+
+  std::uint32_t temp{};
+  auto it = input.begin();
+
+  for (std::size_t i = 0; i < input.size() / 3; ++i) {
+    temp = static_cast<std::uint8_t>(*it++) << 16;
+    temp += static_cast<std::uint8_t>(*it++) << 8;
+    temp += static_cast<std::uint8_t>(*it++);
+    encoded.append(1, kEncodeLookup[(temp & 0x00FC0000) >> 18]);
+    encoded.append(1, kEncodeLookup[(temp & 0x0003F000) >> 12]);
+    encoded.append(1, kEncodeLookup[(temp & 0x00000FC0) >> 6]);
+    encoded.append(1, kEncodeLookup[(temp & 0x0000003F)]);
+  }
+
+  switch (input.size() % 3) {
+    case 1:
+      temp = static_cast<std::uint8_t>(*it++) << 16;
+      encoded.append(1, kEncodeLookup[(temp & 0x00FC0000) >> 18]);
+      encoded.append(1, kEncodeLookup[(temp & 0x0003F000) >> 12]);
+      encoded.append(2, kPadCharacter);
+      break;
+    case 2:
+      temp = static_cast<std::uint8_t>(*it++) << 16;
+      temp += static_cast<std::uint8_t>(*it++) << 8;
+      encoded.append(1, kEncodeLookup[(temp & 0x00FC0000) >> 18]);
+      encoded.append(1, kEncodeLookup[(temp & 0x0003F000) >> 12]);
+      encoded.append(1, kEncodeLookup[(temp & 0x00000FC0) >> 6]);
+      encoded.append(1, kPadCharacter);
+      break;
+  }
+
+  return encoded;
+}
+
+// https://tools.ietf.org/html/rfc4648#section-5
+inline std::string base64url_encode(const std::string& input) {
+  std::string s = base64_encode(input);
+  std::transform(begin(s), end(s), begin(s), [](char c) {
+    if (c == '+') return '-';
+    if (c == '/') return '_';
+    return c;
+  });
+  return s;
+}
+
+inline std::string base64_decode(const std::string& input) {
+  if (input.length() % 4) {
+    throw std::runtime_error("Invalid base64 length!");
+  }
+
+  std::size_t padding = 0;
+
+  if (!input.empty()) {
+    if (input[input.length() - 1] == kPadCharacter) padding++;
+    if (input[input.length() - 2] == kPadCharacter) padding++;
+  }
+
+  std::string decoded;
+  decoded.reserve(((input.length() / 4) * 3) - padding);
+
+  std::uint32_t temp = 0;
+  auto it = input.begin();
+
+  while (it < input.end()) {
+    for (std::size_t i = 0; i < 4; ++i) {
+      temp <<= 6;
+      if (*it >= 0x41 && *it <= 0x5A) {
+        temp |= *it - 0x41;
+      } else if (*it >= 0x61 && *it <= 0x7A) {
+        temp |= *it - 0x47;
+      } else if (*it >= 0x30 && *it <= 0x39) {
+        temp |= *it + 0x04;
+      } else if (*it == 0x2B) {
+        temp |= 0x3E;
+      } else if (*it == 0x2F) {
+        temp |= 0x3F;
+      } else if (*it == kPadCharacter) {
+        switch (input.end() - it) {
+          case 1:
+            decoded.push_back((temp >> 16) & 0x000000FF);
+            decoded.push_back((temp >> 8) & 0x000000FF);
+            return decoded;
+          case 2:
+            decoded.push_back((temp >> 10) & 0x000000FF);
+            return decoded;
+          default:
+            throw std::runtime_error("Invalid padding in base64!");
+        }
+      } else {
+        throw std::runtime_error("Invalid character in base64!");
+      }
+
+      ++it;
+    }
+
+    decoded.push_back((temp >> 16) & 0x000000FF);
+    decoded.push_back((temp >> 8) & 0x000000FF);
+    decoded.push_back((temp) & 0x000000FF);
+  }
+
+  return decoded;
+}
+
+}  // namespace detail
+}  // namespace prometheus
diff --git a/util/tests/CMakeLists.txt b/util/tests/CMakeLists.txt
new file mode 100644
index 00000000..269aea0c
--- /dev/null
+++ b/util/tests/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(unit)
diff --git a/util/tests/unit/BUILD.bazel b/util/tests/unit/BUILD.bazel
new file mode 100644
index 00000000..8603ab60
--- /dev/null
+++ b/util/tests/unit/BUILD.bazel
@@ -0,0 +1,10 @@
+cc_test(
+    name = "unit",
+    srcs = glob(["*.cc"]),
+    copts = ["-Iexternal/googletest/include"],
+    linkstatic = True,
+    deps = [
+        "//util",
+        "@googletest//:gtest_main",
+    ],
+)
diff --git a/util/tests/unit/CMakeLists.txt b/util/tests/unit/CMakeLists.txt
new file mode 100644
index 00000000..f34ca422
--- /dev/null
+++ b/util/tests/unit/CMakeLists.txt
@@ -0,0 +1,15 @@
+add_executable(prometheus_util_test
+  base64_test.cc
+)
+
+target_link_libraries(prometheus_util_test
+  PUBLIC
+    ${PROJECT_NAME}::util
+  PRIVATE
+    GTest::gmock_main
+)
+
+add_test(
+  NAME prometheus_util_test
+  COMMAND prometheus_util_test
+)
diff --git a/util/tests/unit/base64_test.cc b/util/tests/unit/base64_test.cc
new file mode 100644
index 00000000..89e7b405
--- /dev/null
+++ b/util/tests/unit/base64_test.cc
@@ -0,0 +1,78 @@
+#include "prometheus/detail/base64.h"
+
+#include <gtest/gtest.h>
+
+#include <string>
+
+namespace prometheus {
+namespace {
+
+struct TestVector {
+  const std::string decoded;
+  const std::string encoded;
+};
+
+const TestVector testVector[] = {
+    // RFC 3548 examples
+    {"\x14\xfb\x9c\x03\xd9\x7e", "FPucA9l+"},
+    {"\x14\xfb\x9c\x03\xd9", "FPucA9k="},
+    {"\x14\xfb\x9c\x03", "FPucAw=="},
+
+    // RFC 4648 examples
+    {"", ""},
+    {"f", "Zg=="},
+    {"fo", "Zm8="},
+    {"foo", "Zm9v"},
+    {"foob", "Zm9vYg=="},
+    {"fooba", "Zm9vYmE="},
+    {"foobar", "Zm9vYmFy"},
+
+    // Wikipedia examples
+    {"sure.", "c3VyZS4="},
+    {"sure", "c3VyZQ=="},
+    {"sur", "c3Vy"},
+    {"su", "c3U="},
+    {"leasure.", "bGVhc3VyZS4="},
+    {"easure.", "ZWFzdXJlLg=="},
+    {"asure.", "YXN1cmUu"},
+    {"sure.", "c3VyZS4="},
+};
+
+using namespace testing;
+
+TEST(Base64Test, encodeTest) {
+  for (const auto& test_case : testVector) {
+    std::string encoded = detail::base64_encode(test_case.decoded);
+    EXPECT_EQ(test_case.encoded, encoded);
+  }
+}
+
+TEST(Base64Test, encodeUrlTest) {
+  const char unicodeText[] =
+      "\xce\xa0\xcf\x81\xce\xbf\xce\xbc\xce\xb7\xce\xb8\xce\xb5\xcf\x8d\xcf"
+      "\x82";  // Προμηθεύς
+  std::string encoded = detail::base64url_encode(unicodeText);
+  EXPECT_EQ("zqDPgc6_zrzOt864zrXPjc-C", encoded);
+}
+
+TEST(Base64Test, decodeTest) {
+  for (const auto& test_case : testVector) {
+    std::string decoded = detail::base64_decode(test_case.encoded);
+    EXPECT_EQ(test_case.decoded, decoded);
+  }
+}
+
+TEST(Base64Test, rejectInvalidSymbols) {
+  EXPECT_ANY_THROW(detail::base64_decode("...."));
+}
+
+TEST(Base64Test, rejectInvalidInputSize) {
+  EXPECT_ANY_THROW(detail::base64_decode("ABC"));
+}
+
+TEST(Base64Test, rejectInvalidPadding) {
+  EXPECT_ANY_THROW(detail::base64_decode("A==="));
+}
+
+}  // namespace
+}  // namespace prometheus