trallnag/prometheus-fastapi-instrumentator

Health v2 · maintenance only

Adoption not part of the score

1482 stars · 117 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A configurable, modular Python library that instruments FastAPI applications with Prometheus metrics. It exposes default HTTP request metrics and supports custom metric functions via a simple one-line setup.

Use cases

• add prometheus metrics to a fastapi app
• track http request latency and counts in fastapi
• expose a /metrics endpoint for prometheus scraping
• monitor request and response sizes in fastapi
• create custom prometheus metrics for fastapi endpoints
• reduce metric cardinality with grouped status codes

When to choose

• you run a FastAPI service and want Prometheus observability with minimal setup
• you need sensible default HTTP metrics plus the ability to customize metrics
• you want a maintained, widely used instrumentation library

When to avoid

• your app is not built on FastAPI
• you need a full metrics/monitoring stack rather than just instrumentation
• you require metrics for frameworks other than FastAPI

Facets

library · maturity active

monitoring middleware web-framework monitoring web-development backend python prometheus fastapi metrics instrumentation exporter devops web-server

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