OpenTelemetry FastAPI Instrumentation


This library provides automatic and manual instrumentation of FastAPI web frameworks, instrumenting http requests served by applications utilizing the framework.

auto-instrumentation using the opentelemetry-instrumentation package is also supported.


pip install opentelemetry-instrumentation-fastapi


Exclude lists

To exclude certain URLs from being tracked, set the environment variable OTEL_PYTHON_FASTAPI_EXCLUDED_URLS with comma delimited regexes representing which URLs to exclude.

For example,

export OTEL_PYTHON_FASTAPI_EXCLUDED_URLS="client/.*/info,healthcheck"

will exclude requests such as https://site/client/123/info and https://site/xyz/healthcheck.


import fastapi
from opentelemetry.instrumentation.fastapi import FastAPIInstrumentor

app = fastapi.FastAPI()

async def foobar():
    return {"message": "hello world"}


You can also pass the list of urls to exclude explicitly to the instrumentation call:

FastAPIInstrumentor.instrument_app(app, excluded_urls="client/.*/info,healthcheck")


class opentelemetry.instrumentation.fastapi.FastAPIInstrumentor(*args, **kwargs)[source]

Bases: opentelemetry.instrumentation.instrumentor.BaseInstrumentor

An instrumentor for FastAPI

See BaseInstrumentor

static instrument_app(app, server_request_hook=None, client_request_hook=None, client_response_hook=None, tracer_provider=None, excluded_urls=None)[source]

Instrument an uninstrumented FastAPI application.

static uninstrument_app(app)[source]

Return a list of python packages with versions that the will be instrumented.

The format should be the same as used in requirements.txt or

For example, if an instrumentation instruments requests 1.x, this method should look like:

def instrumentation_dependencies(self) -> Collection[str]:

return [‘requests ~= 1.0’]

This will ensure that the instrumentation will only be used when the specified library is present in the environment.

Return type