Repository: trallnag/prometheus-fastapi-instrumentator (language: python)

Issue:
Multi process mode does not work as expected
The way expose currently works does not follow documentation from Prometheus client library.
Cannot See Multiprocess metric under /metric page while suing multiple workers
Basically, there are two weird things while loading /metric page
1. I can see two lines of http_requests_total{handler="/metrics",method="GET",status="2xx"} 33.0. And, it looks like one is not correct. Then, I think this problem related to https://github.com/trallnag/prometheus-fastapi-instrumentator/issues/50 
```

# HELP http_requests_total Total number of requests by method, status and handler.
# TYPE http_requests_total counter
http_requests_total{handler="/metrics",method="GET",status="2xx"} 33.0
# HELP http_request_size_bytes Content length of incoming requests by handler. Only value of header is respected. Otherwise ignored. No percentile calculated. 
# TYPE http_request_size_bytes summary
http_request_size_bytes_count{handler="/metrics"} 33.0
http_request_size_bytes_sum{handler="/metrics"} 0.0
# HELP http_response_size_bytes Content length of outgoing responses by handler. Only value of header is respected. Otherwise ignored. No percentile calculated. 
# TYPE http_response_size_bytes summary
http_response_size_bytes_count{handler="/metrics"} 33.0
http_response_size_bytes_sum{handler="/metrics"} 235523.0
# HELP http_requests_total Total number of requests by method, status and handler.
# TYPE http_requests_total counter
http_requests_total{handler="/metrics",method="GET",status="2xx"} 7.0
```
2. Second strange thing is I already provide **PROMETHEUS_MULTIPROC_DIR=/tmp/prometheus-fastapi-instrumentator/multiproc.** However, I cannot see **Multiprocess metric** under /metric page

It would be appreciated any feedback about is this fixed already or any alternative solutin. 
Appreciated. 

@trallnag 




Discussion / hints:

<img width="1587" alt="image" src="https://user-images.githubusercontent.com/22557099/223348059-033aa161-05c1-48da-b830-5a08b7bc23e6.png">
I put the screenshot that I already go inside the container to double check if PROMETHEUS_MULTIPROC_DIR is successfully created. Hope this information helps troubleshhot 

Fix patch:
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 331e2fb..02c1ada 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -69,10 +69,10 @@ jobs:
 
       - name: Run multi process tests with Pytest
         run: |
-          export PROMETHEUS_MULTIPROC_DIR=/tmp/one-two-three
+          export PROMETHEUS_MULTIPROC_DIR=/tmp/pfi-tests/multiproc
           rm -rf $PROMETHEUS_MULTIPROC_DIR
           mkdir -p $PROMETHEUS_MULTIPROC_DIR
-          poetry run pytest -k test_multiprocess \
+          poetry run pytest -k test_multiproc \
             --cov-append --cov-report=term-missing --cov-report=xml --cov=src
 
       - name: Upload coverage to Codecov
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 77e465d..bc2c8fe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,17 @@ and adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0).
 
 ### Fixed
 
+- Fixed multi process mode in `expose()` method that handles the `/metrics`
+  endpoint. Due to reusing the registry assigned to the instrumentator it could
+  lead to duplicated metrics. Now the endpoint follows recommendation from
+  Prometheus client library documentation. Also improved multi process unit
+  tests. Closed issue
+  [#228](https://github.com/trallnag/prometheus-fastapi-instrumentator/issues/228)
+  and
+  [#227](https://github.com/trallnag/prometheus-fastapi-instrumentator/issues/227).
+  Fixed in pull request
+  [#229](https://github.com/trallnag/prometheus-fastapi-instrumentator/pull/229).
+
 - Fixed `NameError` and "Duplicated timeseries..." errors that started to occur
   with latest versions of Starlette / FastAPI in combination with multiple
   middlewares. Instrumentation closures are now optional and the instrumentator
diff --git a/Taskfile.yaml b/Taskfile.yaml
index 045e329..2b4a7cd 100644
--- a/Taskfile.yaml
+++ b/Taskfile.yaml
@@ -5,6 +5,7 @@ tasks:
     - task: fmt
     - task: lint
     - task: test
+    - task: test-mp
 
   fmt:
     desc: Run formatters.
@@ -22,14 +23,17 @@ tasks:
   test:
     desc: Run tests.
     cmds:
-      - poetry run pytest --cov-report=term-missing --cov-report=xml --cov=src
+      - poetry run pytest {{ .COVERAGE }}
+    vars:
+      COVERAGE: --cov-report=term-missing --cov-report=xml --cov=src
 
   test-mp:
     desc: Run multi process tests.
     cmds:
       - rm -rf $PROMETHEUS_MULTIPROC_DIR
       - mkdir -p $PROMETHEUS_MULTIPROC_DIR
-      - poetry run pytest -k test_multiprocess
-        --cov-append --cov-report=term-missing --cov-report=xml --cov=src
+      - poetry run pytest -k test_multiproc {{ .COVERAGE }}
+    vars:
+      COVERAGE: --cov-append --cov-report=term-missing --cov-report=xml --cov=src
     env:
-      PROMETHEUS_MULTIPROC_DIR: /tmp/prometheus-fastapi-instrumentator/multiproc
+      PROMETHEUS_MULTIPROC_DIR: /tmp/pfi-tests/multiproc
diff --git a/poetry.lock b/poetry.lock
index c481036..94dc752 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -79,32 +79,46 @@ tests-no-zope = ["cloudpickle", "cloudpickle", "hypothesis", "hypothesis", "mypy
 
 [[package]]
 name = "black"
-version = "22.12.0"
+version = "23.1.0"
 description = "The uncompromising code formatter."
 category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
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-    {file = "black-22.12.0-cp310-cp310-win_amd64.whl", hash = "sha256:159a46a4947f73387b4d83e87ea006dbb2337eab6c879620a3ba52699b1f4351"},
-    {file = "black-22.12.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:d30b212bffeb1e252b31dd269dfae69dd17e06d92b87ad26e23890f3efea366f"},
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+    {file = "black-23.1.0-cp310-cp310-macosx_10_16_arm64.whl", hash = "sha256:b6a92a41ee34b883b359998f0c8e6eb8e99803aa8bf3123bf2b2e6fec505a221"},
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+    {file = "black-23.1.0-cp310-cp310-win_amd64.whl", hash = "sha256:9afd3f493666a0cd8f8df9a0200c6359ac53940cbde049dcb1a7eb6ee2dd7074"},
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+    {file = "black-23.1.0-cp39-cp39-win_amd64.whl", hash = "sha256:0680d4380db3719ebcfb2613f34e86c8e6d15ffeabcf8ec59355c5e7b85bb555"},
+    {file = "black-23.1.0-py3-none-any.whl", hash = "sha256:7a0f701d314cfa0896b9001df70a530eb2472babb76086344e688829efd97d32"},
+    {file = "black-23.1.0.tar.gz", hash = "sha256:b0bd97bea8903f5a2ba7219257a44e3f1f9d00073d6cc1add68f0beec69692ac"},
 ]
 
 [package.dependencies]
 click = ">=8.0.0"
 mypy-extensions = ">=0.4.3"
+packaging = ">=22.0"
 pathspec = ">=0.9.0"
 platformdirs = ">=2"
-tomli = {version = ">=1.1.0", markers = "python_full_version < \"3.11.0a7\""}
+tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
 typed-ast = {version = ">=1.4.2", markers = "python_version < \"3.8\" and implementation_name == \"cpython\""}
 typing-extensions = {version = ">=3.10.0.0", markers = "python_version < \"3.10\""}
 
@@ -126,114 +140,89 @@ files = [
     {file = "certifi-2022.12.7.tar.gz", hash = "sha256:35824b4c3a97115964b408844d64aa14db1cc518f6562e8d7261699d1350a9e3"},
 ]
 
-[[package]]
-name = "cfgv"
-version = "3.3.1"
-description = "Validate configuration and produce human readable error messages."
-category = "dev"
-optional = false
-python-versions = ">=3.6.1"
-files = [
-    {file = "cfgv-3.3.1-py2.py3-none-any.whl", hash = "sha256:c6a0883f3917a037485059700b9e75da2464e6c27051014ad85ba6aaa5884426"},
-    {file = "cfgv-3.3.1.tar.gz", hash = "sha256:f5a830efb9ce7a445376bb66ec94c638a9787422f96264c98edc6bdeed8ab736"},
-]
-
 [[package]]
 name = "charset-normalizer"
-version = "3.0.1"
+version = "3.1.0"
 description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
 category = "dev"
 optional = false
-python-versions = "*"
+python-versions = ">=3.7.0"
 files = [
-    {file = "charset-normalizer-3.0.1.tar.gz", hash = "sha256:ebea339af930f8ca5d7a699b921106c6e29c617fe9606fa7baa043c1cdae326f"},
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 ]
 
 [[package]]
@@ -333,35 +322,23 @@ toml = ["tomli"]
 
 [[package]]
 name = "devtools"
-version = "0.9.0"
+version = "0.10.0"
 description = "Python's missing debug print command, and more."
 category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
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+    {file = "devtools-0.10.0-py3-none-any.whl", hash = "sha256:b0bc02043bb032cdfb93e227226e2fea1aaea8f5a31fca25fabc4eadca22f228"},
+    {file = "devtools-0.10.0.tar.gz", hash = "sha256:6eb7c4fa7c4b90e5cfe623537a9961d1dc3199d8be0981802c6931cd8f02418f"},
 ]
 
 [package.dependencies]
 asttokens = ">=2.0.0,<3.0.0"
-executing = ">=0.8.0,<1.0.0"
+executing = ">=1.1.1"
 
 [package.extras]
 pygments = ["pygments (>=2.2.0)"]
 
-[[package]]
-name = "distlib"
-version = "0.3.6"
-description = "Distribution utilities"
-category = "dev"
-optional = false
-python-versions = "*"
-files = [
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-]
-
 [[package]]
 name = "exceptiongroup"
 version = "1.1.0"
@@ -379,26 +356,29 @@ test = ["pytest (>=6)"]
 
 [[package]]
 name = "executing"
-version = "0.10.0"
+version = "1.2.0"
 description = "Get the currently executing AST node of a frame, and other information"
 category = "dev"
 optional = false
 python-versions = "*"
 files = [
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+    {file = "executing-1.2.0-py2.py3-none-any.whl", hash = "sha256:0314a69e37426e3608aada02473b4161d4caf5a4b244d1d0c48072b8fee7bacc"},
+    {file = "executing-1.2.0.tar.gz", hash = "sha256:19da64c18d2d851112f09c287f8d3dbbdf725ab0e569077efb6cdcbd3497c107"},
 ]
 
+[package.extras]
+tests = ["asttokens", "littleutils", "pytest", "rich"]
+
 [[package]]
 name = "fastapi"
-version = "0.92.0"
+version = "0.93.0"
 description = "FastAPI framework, high performance, easy to learn, fast to code, ready for production"
 category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
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-    {file = "fastapi-0.92.0.tar.gz", hash = "sha256:023a0f5bd2c8b2609014d3bba1e14a1d7df96c6abea0a73070621c9862b9a4de"},
+    {file = "fastapi-0.93.0-py3-none-any.whl", hash = "sha256:d6e6db5f096d67b475e2a09e1124983554f634fad50297de85fc3de0583df13a"},
+    {file = "fastapi-0.93.0.tar.gz", hash = "sha256:c2944febec6da706f4c82cdfa0de48afda960c8fbde29dec88697d55a67d7718"},
 ]
 
 [package.dependencies]
@@ -408,25 +388,9 @@ starlette = ">=0.25.0,<0.26.0"
 [package.extras]
 all = ["email-validator (>=1.1.1)", "httpx (>=0.23.0)", "itsdangerous (>=1.1.0)", "jinja2 (>=2.11.2)", "orjson (>=3.2.1)", "python-multipart (>=0.0.5)", "pyyaml (>=5.3.1)", "ujson (>=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0)", "uvicorn[standard] (>=0.12.0)"]
 dev = ["pre-commit (>=2.17.0,<3.0.0)", "ruff (==0.0.138)", "uvicorn[standard] (>=0.12.0,<0.21.0)"]
-doc = ["mdx-include (>=1.4.1,<2.0.0)", "mkdocs (>=1.1.2,<2.0.0)", "mkdocs-markdownextradata-plugin (>=0.1.7,<0.3.0)", "mkdocs-material (>=8.1.4,<9.0.0)", "pyyaml (>=5.3.1,<7.0.0)", "typer[all] (>=0.6.1,<0.8.0)"]
+doc = ["mdx-include (>=1.4.1,<2.0.0)", "mkdocs (>=1.1.2,<2.0.0)", "mkdocs-markdownextradata-plugin (>=0.1.7,<0.3.0)", "mkdocs-material (>=8.1.4,<9.0.0)", "pyyaml (>=5.3.1,<7.0.0)", "typer-cli (>=0.0.13,<0.0.14)", "typer[all] (>=0.6.1,<0.8.0)"]
 test = ["anyio[trio] (>=3.2.1,<4.0.0)", "black (==22.10.0)", "coverage[toml] (>=6.5.0,<8.0)", "databases[sqlite] (>=0.3.2,<0.7.0)", "email-validator (>=1.1.1,<2.0.0)", "flask (>=1.1.2,<3.0.0)", "httpx (>=0.23.0,<0.24.0)", "isort (>=5.0.6,<6.0.0)", "mypy (==0.982)", "orjson (>=3.2.1,<4.0.0)", "passlib[bcrypt] (>=1.7.2,<2.0.0)", "peewee (>=3.13.3,<4.0.0)", "pytest (>=7.1.3,<8.0.0)", "python-jose[cryptography] (>=3.3.0,<4.0.0)", "python-multipart (>=0.0.5,<0.0.6)", "pyyaml (>=5.3.1,<7.0.0)", "ruff (==0.0.138)", "sqlalchemy (>=1.3.18,<1.4.43)", "types-orjson (==3.6.2)", "types-ujson (==5.6.0.0)", "ujson (>=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0,<6.0.0)"]
 
-[[package]]
-name = "filelock"
-version = "3.9.0"
-description = "A platform independent file lock."
-category = "dev"
-optional = false
-python-versions = ">=3.7"
-files = [
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-    {file = "filelock-3.9.0.tar.gz", hash = "sha256:7b319f24340b51f55a2bf7a12ac0755a9b03e718311dac567a0f4f7fabd2f5de"},
-]
-
-[package.extras]
-docs = ["furo (>=2022.12.7)", "sphinx (>=5.3)", "sphinx-autodoc-typehints (>=1.19.5)"]
-testing = ["covdefaults (>=2.2.2)", "coverage (>=7.0.1)", "pytest (>=7.2)", "pytest-cov (>=4)", "pytest-timeout (>=2.1)"]
-
 [[package]]
 name = "flake8"
 version = "5.0.4"
@@ -445,6 +409,27 @@ mccabe = ">=0.7.0,<0.8.0"
 pycodestyle = ">=2.9.0,<2.10.0"
 pyflakes = ">=2.5.0,<2.6.0"
 
+[[package]]
+name = "gunicorn"
+version = "20.1.0"
+description = "WSGI HTTP Server for UNIX"
+category = "dev"
+optional = false
+python-versions = ">=3.5"
+files = [
+    {file = "gunicorn-20.1.0-py3-none-any.whl", hash = "sha256:9dcc4547dbb1cb284accfb15ab5667a0e5d1881cc443e0677b4882a4067a807e"},
+    {file = "gunicorn-20.1.0.tar.gz", hash = "sha256:e0a968b5ba15f8a328fdfd7ab1fcb5af4470c28aaf7e55df02a99bc13138e6e8"},
+]
+
+[package.dependencies]
+setuptools = ">=3.0"
+
+[package.extras]
+eventlet = ["eventlet (>=0.24.1)"]
+gevent = ["gevent (>=1.4.0)"]
+setproctitle = ["setproctitle"]
+tornado = ["tornado (>=0.2)"]
+
 [[package]]
 name = "h11"
 version = "0.14.0"
@@ -506,21 +491,6 @@ cli = ["click (>=8.0.0,<9.0.0)", "pygments (>=2.0.0,<3.0.0)", "rich (>=10,<13)"]
 http2 = ["h2 (>=3,<5)"]
 socks = ["socksio (>=1.0.0,<2.0.0)"]
 
-[[package]]
-name = "identify"
-version = "2.5.18"
-description = "File identification library for Python"
-category = "dev"
-optional = false
-python-versions = ">=3.7"
-files = [
-    {file = "identify-2.5.18-py2.py3-none-any.whl", hash = "sha256:93aac7ecf2f6abf879b8f29a8002d3c6de7086b8c28d88e1ad15045a15ab63f9"},
-    {file = "identify-2.5.18.tar.gz", hash = "sha256:89e144fa560cc4cffb6ef2ab5e9fb18ed9f9b3cb054384bab4b95c12f6c309fe"},
-]
-
-[package.extras]
-license = ["ukkonen"]
-
 [[package]]
 name = "idna"
 version = "3.4"
@@ -597,45 +567,49 @@ files = [
 
 [[package]]
 name = "mypy"
-version = "0.971"
+version = "1.1.1"
 description = "Optional static typing for Python"
 category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
 files = [
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-    {file = "mypy-0.971-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:98e02d56ebe93981c41211c05adb630d1d26c14195d04d95e49cd97dbc046dc5"},
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 ]
 
 [package.dependencies]
-mypy-extensions = ">=0.4.3"
+mypy-extensions = ">=1.0.0"
 tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
 typed-ast = {version = ">=1.4.0,<2", markers = "python_version < \"3.8\""}
 typing-extensions = ">=3.10"
 
 [package.extras]
 dmypy = ["psutil (>=4.0)"]
+install-types = ["pip"]
 python2 = ["typed-ast (>=1.4.0,<2)"]
 reports = ["lxml"]
 
@@ -651,21 +625,6 @@ files = [
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 ]
 
-[[package]]
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-description = "Node.js virtual environment builder"
-category = "dev"
-optional = false
-python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*"
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-
-[package.dependencies]
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-
 [[package]]
 name = "packaging"
 version = "23.0"
@@ -692,22 +651,22 @@ files = [
 
 [[package]]
 name = "platformdirs"
-version = "2.6.2"
+version = "3.1.0"
 description = "A small Python package for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
 category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
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 [package.extras]
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-test = ["appdirs (==1.4.4)", "covdefaults (>=2.2.2)", "pytest (>=7.2)", "pytest-cov (>=4)", "pytest-mock (>=3.10)"]
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+test = ["appdirs (==1.4.4)", "covdefaults (>=2.2.2)", "pytest (>=7.2.1)", "pytest-cov (>=4)", "pytest-mock (>=3.10)"]
 
 [[package]]
 name = "pluggy"
@@ -728,26 +687,6 @@ importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 dev = ["pre-commit", "tox"]
 testing = ["pytest", "pytest-benchmark"]
 
-[[package]]
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-description = "A framework for managing and maintaining multi-language pre-commit hooks."
-category = "dev"
-optional = false
-python-versions = ">=3.7"
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-nodeenv = ">=0.11.1"
-pyyaml = ">=5.1"
-virtualenv = ">=20.10.0"
-
 [[package]]
 name = "prometheus-client"
 version = "0.16.0"
@@ -865,16 +804,36 @@ tomli = {version = ">=1.0.0", markers = "python_version < \"3.11\""}
 [package.extras]
 testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "xmlschema"]
 
+[[package]]
+name = "pytest-asyncio"
+version = "0.20.3"
+description = "Pytest support for asyncio"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
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+
+[package.dependencies]
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+typing-extensions = {version = ">=3.7.2", markers = "python_version < \"3.8\""}
+
+[package.extras]
+docs = ["sphinx (>=5.3)", "sphinx-rtd-theme (>=1.0)"]
+testing = ["coverage (>=6.2)", "flaky (>=3.5.0)", "hypothesis (>=5.7.1)", "mypy (>=0.931)", "pytest-trio (>=0.7.0)"]
+
 [[package]]
 name = "pytest-cov"
-version = "3.0.0"
+version = "4.0.0"
 description = "Pytest plugin for measuring coverage."
 category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
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 ]
 
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 global = ["platformdirs (>=1.4.4)"]
 validation = ["pydantic (>=1.7.4)"]
 
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-    {file = "PyYAML-6.0.tar.gz", hash = "sha256:68fb519c14306fec9720a2a5b45bc9f0c8d1b9c72adf45c37baedfcd949c35a2"},
-]
-
 [[package]]
 name = "requests"
 version = "2.28.2"
@@ -1019,14 +928,14 @@ doc = ["pytoolconfig[doc]", "sphinx (>=4.5.0)", "sphinx-autodoc-typehints (>=1.1
 
 [[package]]
 name = "setuptools"
-version = "67.4.0"
+version = "67.6.0"
 description = "Easily download, build, install, upgrade, and uninstall Python packages"
 category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "setuptools-67.4.0-py3-none-any.whl", hash = "sha256:f106dee1b506dee5102cc3f3e9e68137bbad6d47b616be7991714b0c62204251"},
-    {file = "setuptools-67.4.0.tar.gz", hash = "sha256:e5fd0a713141a4a105412233c63dc4e17ba0090c8e8334594ac790ec97792330"},
+    {file = "setuptools-67.6.0-py3-none-any.whl", hash = "sha256:b78aaa36f6b90a074c1fa651168723acbf45d14cb1196b6f02c0fd07f17623b2"},
+    {file = "setuptools-67.6.0.tar.gz", hash = "sha256:2ee892cd5f29f3373097f5a814697e397cf3ce313616df0af11231e2ad118077"},
 ]
 
 [package.extras]
@@ -1172,28 +1081,6 @@ typing-extensions = {version = "*", markers = "python_version < \"3.8\""}
 [package.extras]
 standard = ["colorama (>=0.4)", "httptools (>=0.5.0)", "python-dotenv (>=0.13)", "pyyaml (>=5.1)", "uvloop (>=0.14.0,!=0.15.0,!=0.15.1)", "watchfiles (>=0.13)", "websockets (>=10.4)"]
 
-[[package]]
-name = "virtualenv"
-version = "20.16.2"
-description = "Virtual Python Environment builder"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-files = [
-    {file = "virtualenv-20.16.2-py2.py3-none-any.whl", hash = "sha256:635b272a8e2f77cb051946f46c60a54ace3cb5e25568228bd6b57fc70eca9ff3"},
-    {file = "virtualenv-20.16.2.tar.gz", hash = "sha256:0ef5be6d07181946891f5abc8047fda8bc2f0b4b9bf222c64e6e8963baee76db"},
-]
-
-[package.dependencies]
-distlib = ">=0.3.1,<1"
-filelock = ">=3.2,<4"
-importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
-platformdirs = ">=2,<3"
-
-[package.extras]
-docs = ["proselint (>=0.10.2)", "sphinx (>=3)", "sphinx-argparse (>=0.2.5)", "sphinx-rtd-theme (>=0.4.3)", "towncrier (>=21.3)"]
-testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "packaging (>=20.0)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)"]
-
 [[package]]
 name = "zipp"
 version = "3.15.0"
@@ -1213,4 +1100,4 @@ testing = ["big-O", "flake8 (<5)", "jaraco.functools", "jaraco.itertools", "more
 [metadata]
 lock-version = "2.0"
 python-versions = ">= 3.7.0, < 4.0.0"
-content-hash = "0868d18794b8cf54d229a6e87779ef8129f3b7cc2d86dea9e19f4a5d232f054c"
+content-hash = "a6fdc9d73c0e827a98d867e644f701814890de69f5499aaac9ef9120af08c410"
diff --git a/pyproject.toml b/pyproject.toml
index 0afdadf..a0c50c5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,22 +16,22 @@ keywords = ["prometheus", "instrumentation", "fastapi", "exporter", "metrics"]
 python = ">= 3.7.0, < 4.0.0"
 fastapi = ">= 0.38.1, < 1.0.0"
 prometheus-client = ">= 0.8.0, < 1.0.0"
-starlette = "0.25.0"
 
 [tool.poetry.group.dev.dependencies]
-httpx = "^0.23.1"
-black = "^22.12.0"
+httpx = "^0.23.3"
+black = "^23.1.0"
 flake8 = "^5.0.4"
-requests = "^2.28.1"
-pytest = "^7.2.0"
-pytest-cov = "^3.0.0"
-rope = "^1.6.0"
+requests = "^2.28.2"
+pytest = "^7.2.2"
+pytest-cov = "^4.0.0"
+rope = "^1.7.0"
 isort = "^5.11.3"
-mypy = "^0.971"
-devtools = "^0.9.0"
-pre-commit = "^2.20.0"
-asgiref = "^3.5.2"
+mypy = "^1.1.1"
+devtools = "^0.10.0"
+asgiref = "^3.6.0"
 uvicorn = "^0.20.0"
+gunicorn = "^20.1.0"
+pytest-asyncio = "^0.20.3"
 
 [tool.black]
 line-length = 90
@@ -46,3 +46,4 @@ ignore_missing_imports = true
 [tool.pytest.ini_options]
 norecursedirs = "tests/helpers"
 markers = ["slow: mark test as slow."]
+asyncio_mode = "auto"
diff --git a/src/prometheus_fastapi_instrumentator/instrumentation.py b/src/prometheus_fastapi_instrumentator/instrumentation.py
index 2fd4cca..82a75d5 100644
--- a/src/prometheus_fastapi_instrumentator/instrumentation.py
+++ b/src/prometheus_fastapi_instrumentator/instrumentation.py
@@ -32,7 +32,7 @@ def __init__(
         should_round_latency_decimals: bool = False,
         should_respect_env_var: bool = False,
         should_instrument_requests_inprogress: bool = False,
-        excluded_handlers: List[str] = None,
+        excluded_handlers: List[str] = [],
         round_latency_decimals: int = 4,
         env_var_name: str = "ENABLE_METRICS",
         inprogress_name: str = "http_requests_inprogress",
@@ -109,9 +109,6 @@ def __init__(
         self.inprogress_name = inprogress_name
         self.inprogress_labels = inprogress_labels
 
-        if excluded_handlers is None:
-            excluded_handlers = []
-
         self.excluded_handlers = [re.compile(path) for path in excluded_handlers]
 
         self.instrumentations: List[Callable[[metrics.Info], None]] = []
@@ -131,17 +128,15 @@ def __init__(
 
         if registry:
             self.registry = registry
-        elif "PROMETHEUS_MULTIPROC_DIR" in os.environ:
+        else:
+            self.registry = REGISTRY
+
+        if "PROMETHEUS_MULTIPROC_DIR" in os.environ:
             pmd = os.environ["PROMETHEUS_MULTIPROC_DIR"]
-            if os.path.isdir(pmd):
-                self.registry = CollectorRegistry()
-                multiprocess.MultiProcessCollector(self.registry)
-            else:
+            if not os.path.isdir(pmd):
                 raise ValueError(
                     f"Env var PROMETHEUS_MULTIPROC_DIR='{pmd}' not a directory."
                 )
-        else:
-            self.registry = REGISTRY
 
     def instrument(
         self,
@@ -255,12 +250,19 @@ def expose(
         def metrics(request: Request):
             """Endpoint that serves Prometheus metrics."""
 
+            ephemeral_registry = self.registry
+            if "PROMETHEUS_MULTIPROC_DIR" in os.environ:
+                ephemeral_registry = CollectorRegistry()
+                multiprocess.MultiProcessCollector(ephemeral_registry)
+
             if should_gzip and "gzip" in request.headers.get("Accept-Encoding", ""):
-                resp = Response(content=gzip.compress(generate_latest(self.registry)))
+                resp = Response(
+                    content=gzip.compress(generate_latest(ephemeral_registry))
+                )
                 resp.headers["Content-Type"] = CONTENT_TYPE_LATEST
                 resp.headers["Content-Encoding"] = "gzip"
             else:
-                resp = Response(content=generate_latest(self.registry))
+                resp = Response(content=generate_latest(ephemeral_registry))
                 resp.headers["Content-Type"] = CONTENT_TYPE_LATEST
 
             return resp


Test patch:
diff --git a/tests/helpers/utils.py b/tests/helpers/utils.py
index d420f03..abfc7bc 100644
--- a/tests/helpers/utils.py
+++ b/tests/helpers/utils.py
@@ -1,3 +1,6 @@
+import os
+import shutil
+
 from prometheus_client import REGISTRY
 
 
@@ -25,3 +28,23 @@ def reset_collectors() -> None:
     gc_collector.GCCollector()
 
     print(f"after re-register collectors={list(REGISTRY._collector_to_names.keys())}")
+
+
+def is_prometheus_multiproc_valid() -> bool:
+    """Checks if PROMETHEUS_MULTIPROC_DIR is set and a directory."""
+
+    if "PROMETHEUS_MULTIPROC_DIR" in os.environ:
+        pmd = os.environ["PROMETHEUS_MULTIPROC_DIR"]
+        if os.path.isdir(pmd):
+            return True
+    else:
+        return False
+
+
+def delete_dir_content(dirpath):
+    for filename in os.listdir(dirpath):
+        filepath = os.path.join(dirpath, filename)
+        try:
+            shutil.rmtree(filepath)
+        except OSError:
+            os.remove(filepath)
diff --git a/tests/test_instrumentation.py b/tests/test_instrumentation.py
index d132719..7000ae7 100644
--- a/tests/test_instrumentation.py
+++ b/tests/test_instrumentation.py
@@ -3,7 +3,6 @@
 from http import HTTPStatus
 from typing import Any, Dict, Optional
 
-import pytest
 from fastapi import FastAPI, HTTPException
 from prometheus_client import CONTENT_TYPE_LATEST, REGISTRY, Info, generate_latest
 from requests import Response as TestClientResponse
@@ -410,9 +409,7 @@ def test_excluding_handlers_regex():
 
 def test_excluded_handlers_none():
     app = create_app()
-    exporter = (
-        Instrumentator(excluded_handlers=None).add(metrics.latency()).instrument(app)
-    )
+    exporter = Instrumentator(excluded_handlers=[]).add(metrics.latency()).instrument(app)
     expose_metrics(app)
 
     assert len(exporter.excluded_handlers) == 0
@@ -585,118 +582,3 @@ def sync_function(_):
     )
 
     assert result_sync > 0
-
-
-# ==============================================================================
-# Test with multiprocess reg.
-
-
-def is_prometheus_multiproc_set():
-    if "PROMETHEUS_MULTIPROC_DIR" in os.environ:
-        pmd = os.environ["PROMETHEUS_MULTIPROC_DIR"]
-        if os.path.isdir(pmd):
-            return True
-    else:
-        return False
-
-
-# The environment variable MUST be set before anything regarding Prometheus is
-# imported. That is why we cannot simply use `tempfile` or the fixtures
-# provided by pytest. Test with:
-#       mkdir -p /tmp/test_multiproc;
-#       export PROMETHEUS_MULTIPROC_DIR=/tmp/test_multiproc;
-#       pytest -k test_multiprocess_reg;
-#       rm -rf /tmp/test_multiproc;
-#       unset PROMETHEUS_MULTIPROC_DIR
-
-
-@pytest.mark.skipif(
-    is_prometheus_multiproc_set() is False,
-    reason="Environment variable must be set before starting Python process.",
-)
-def test_multiprocess_reg():
-    app = create_app()
-    Instrumentator(excluded_handlers=["/metrics"]).add(
-        metrics.latency(
-            buckets=(
-                1,
-                2,
-                3,
-            )
-        )
-    ).instrument(app).expose(app)
-    client = TestClient(app)
-
-    get_response(client, "/")
-
-    response = get_response(client, "/metrics")
-    assert response.status_code == 200
-    assert b"Multiprocess" in response.content
-    assert b"# HELP process_cpu_seconds_total" not in response.content
-    assert b"http_request_duration_seconds" in response.content
-
-
-@pytest.mark.skipif(is_prometheus_multiproc_set() is True, reason="Will never work.")
-def test_multiprocess_reg_is_not(monkeypatch, tmp_path):
-    monkeypatch.setenv("PROMETHEUS_MULTIPROC_DIR", str(tmp_path))
-
-    app = create_app()
-    Instrumentator(excluded_handlers=["/metrics"]).add(metrics.latency()).instrument(
-        app
-    ).expose(app)
-
-    client = TestClient(app)
-
-    get_response(client, "/")
-
-    response = get_response(client, "/metrics")
-    assert response.status_code == 200
-    assert b"" == response.content
-
-
-@pytest.mark.skipif(
-    is_prometheus_multiproc_set() is True, reason="Just test handling of env detection."
-)
-def test_multiprocess_env_folder(monkeypatch, tmp_path):
-    monkeypatch.setenv("PROMETHEUS_MULTIPROC_DIR", "DOES/NOT/EXIST")
-
-    app = create_app()
-    with pytest.raises(Exception):
-        Instrumentator(buckets=(1, 2, 3,)).add(
-            metrics.latency()
-        ).instrument(app)
-
-
-# ------------------------------------------------------------------------------
-# Test inprogress.
-
-
-@pytest.mark.skipif(
-    is_prometheus_multiproc_set() is False,
-    reason="Environment variable must be set before starting Python process.",
-)
-def test_multiprocess_inprogress():
-    app = create_app()
-    Instrumentator(
-        should_instrument_requests_inprogress=True, inprogress_labels=True
-    ).instrument(app).expose(app)
-    client = TestClient(app)
-
-    async def main():
-        loop = asyncio.get_event_loop()
-        futures = [
-            loop.run_in_executor(None, get_response, client, "/sleep?seconds=0.1")
-            for i in range(5)
-        ]
-        for response in await asyncio.gather(*futures):
-            assert response.status_code == 200
-
-    loop = asyncio.get_event_loop()
-    loop.run_until_complete(main())
-
-    response = get_response(client, "/metrics")
-    assert response.status_code == 200
-    assert b"Multiprocess" in response.content
-    assert b"# HELP process_cpu_seconds_total" not in response.content
-    assert b"http_request_duration_seconds" in response.content
-    assert b'http_requests_inprogress{handler="/sleep",method="GET"}' in response.content
diff --git a/tests/test_instrumentator_multiproc.py b/tests/test_instrumentator_multiproc.py
new file mode 100644
index 0000000..5a81fd2
--- /dev/null
+++ b/tests/test_instrumentator_multiproc.py
@@ -0,0 +1,213 @@
+"""
+Testing things in multi process mode is super weird, at least to me. I don't
+understand how the registries in the Prometheus client library work once multi
+process mode is activated. For now I seem to get by trying to reset collectors,
+even though it does not fully reset everything.
+"""
+
+import asyncio
+from datetime import datetime
+
+import pytest
+from fastapi import FastAPI
+from helpers import utils
+from httpx import AsyncClient
+from starlette.testclient import TestClient
+
+from prometheus_fastapi_instrumentator import Instrumentator
+
+
+@pytest.mark.skipif(
+    utils.is_prometheus_multiproc_valid(),
+    reason="Environment variable must be not set in parent process.",
+)
+def test_multiproc_dir_not_found(monkeypatch):
+    """Tests failing early if env var is set but dir does not exist."""
+
+    monkeypatch.setenv("PROMETHEUS_MULTIPROC_DIR", "/DOES/NOT/EXIST")
+
+    with pytest.raises(ValueError, match="not a directory"):
+        Instrumentator().instrument(FastAPI())
+
+
+@pytest.mark.skipif(
+    utils.is_prometheus_multiproc_valid(),
+    reason="Environment variable must be not set in parent process.",
+)
+def test_multiproc_expose_no_dir(monkeypatch):
+    """
+    Tests that metrics endpoint will raise exception if dir does not exist.
+    Method expose that contains closure does not check for existence.
+    """
+
+    app = FastAPI()
+    instrumentator = Instrumentator()
+    monkeypatch.setenv("PROMETHEUS_MULTIPROC_DIR", "/DOES/NOT/EXIST")
+    instrumentator.instrument(app).expose(app)
+
+    with pytest.raises(ValueError, match="env PROMETHEUS_MULTIPROC_DIR"):
+        TestClient(app).get("/metrics")
+
+
+@pytest.mark.skipif(
+    utils.is_prometheus_multiproc_valid(),
+    reason="Environment variable must be not set in parent process.",
+)
+def test_multiproc_anti_test(monkeypatch, tmp_path):
+    """
+    Shows weird behavior of Prometheus client library. If env var is monkey
+    patched, no errors whatsoever occur, but the metrics endpoint returns
+    nothing. Also the internal registry contains no metrics.
+
+    The moment I run this test with the env var set manually in the parent
+    process, things start to work.
+    """
+
+    app = FastAPI()
+    monkeypatch.setenv("PROMETHEUS_MULTIPROC_DIR", str(tmp_path))
+    Instrumentator().instrument(app).expose(app)
+
+    client = TestClient(app)
+    client.get("/dummy")
+
+    metrics_response = client.get("/metrics")
+    assert metrics_response.status_code == 200
+
+    metrics_content = metrics_response.content.decode()
+    print("GET /metrics\n" + metrics_content)
+    assert len(metrics_content) == 0
+
+
+@pytest.mark.skipif(
+    not utils.is_prometheus_multiproc_valid(),
+    reason="Environment variable must be set in parent process.",
+)
+def test_multiproc_no_default_stuff():
+    """Tests that multi process mode is activated.
+
+    It is checked indirectly by asserting that metrics that are not supported in
+    multi process mode are not exposed by Prometheus.
+    """
+
+    assert utils.is_prometheus_multiproc_valid()
+    utils.reset_collectors()
+
+    app = FastAPI()
+    Instrumentator().instrument(app).expose(app)
+    client = TestClient(app)
+
+    metrics_response = client.get("/metrics")
+    assert metrics_response.status_code == 200
+
+    metrics_content = metrics_response.content.decode()
+    print("GET /metrics\n" + metrics_content)
+    assert "process_open_fds" not in metrics_content
+
+
+@pytest.mark.skipif(
+    not utils.is_prometheus_multiproc_valid(),
+    reason="Environment variable must be set in parent process.",
+)
+def test_multiproc_correct_count():
+    """Tests that counter metric has expected value with multi process mode."""
+
+    assert utils.is_prometheus_multiproc_valid()
+    utils.reset_collectors()
+
+    app = FastAPI()
+    Instrumentator().instrument(app).expose(app)
+    client = TestClient(app)
+
+    @app.get("/ping")
+    def get_ping():
+        return "pong"
+
+    client.get("/ping")
+    client.get("/ping")
+    client.get("/ping")
+
+    metrics_response = client.get("/metrics")
+    assert metrics_response.status_code == 200
+
+    metrics_content = metrics_response.content.decode()
+    print("GET /metrics\n" + metrics_content)
+    want = 'http_requests_total{handler="/ping",method="GET",status="2xx"} 3.0\n'
+    assert want in metrics_content
+
+
+@pytest.mark.skipif(
+    not utils.is_prometheus_multiproc_valid(),
+    reason="Environment variable must be set in parent process.",
+)
+async def test_multiproc_inprogress_metric():
+    """
+    Tests that in-progress metric is counting correctly in multi process mode.
+    Depends on sleeping to get metrics while other requests are still running.
+    """
+
+    assert utils.is_prometheus_multiproc_valid()
+    utils.reset_collectors()
+
+    app = FastAPI()
+
+    @app.get("/sleep")
+    async def get_sleep(seconds: float):
+        await asyncio.sleep(seconds)
+        return f"Slept for {seconds}s"
+
+    Instrumentator(
+        should_instrument_requests_inprogress=True, inprogress_labels=True
+    ).instrument(app).expose(app)
+
+    async with AsyncClient(app=app, base_url="http://test") as ac:
+        tasks = []
+        for i in range(3):
+            tasks.append(asyncio.create_task(ac.get("/sleep?seconds=1")))
+        print("1:", datetime.utcnow())
+        await asyncio.sleep(0.5)
+        print("2:", datetime.utcnow())
+        metrics_response = await ac.get("/metrics")
+        await asyncio.gather(*tasks)
+
+    assert metrics_response.status_code == 200
+
+    metrics_content = metrics_response.content.decode()
+    print("3:", datetime.utcnow())
+    print("GET /metrics\n" + metrics_content)
+    assert (
+        'http_requests_inprogress{handler="/sleep",method="GET"} 3.0' in metrics_content
+    )
+    assert (
+        'http_requests_inprogress{handler="/metrics",method="GET"} 1.0' in metrics_content
+    )
+
+
+@pytest.mark.skipif(
+    not utils.is_prometheus_multiproc_valid(),
+    reason="Environment variable must be set in parent process.",
+)
+def test_multiproc_no_duplicates():
+    """
+    Tests that metrics endpoint does not contain duplicate metrics. According to
+    documentation of Prometheus client library this can happen if metrics
+    endpoint is setup incorrectly and multi process mode is activated.
+
+    Can be done by having an endpoint that uses registry created outside of
+    function body.
+    """
+
+    assert utils.is_prometheus_multiproc_valid()
+    utils.reset_collectors()
+
+    app = FastAPI()
+    Instrumentator().instrument(app).expose(app)
+    client = TestClient(app)
+
+    metrics_response = client.get("/metrics")
+    assert metrics_response.status_code == 200
+
+    metrics_content = metrics_response.content.decode()
+    print("GET /metrics\n" + metrics_content)
+
+    substring = "# TYPE http_requests_total counter"
+    assert metrics_content.count(substring) == 1