# prometheus/OpenMetrics

Evolving the Prometheus exposition format into a standard.

Repository: https://github.com/prometheus/OpenMetrics
Canonical: https://ross.abutalabs.com/products/openmetrics
Homepage: https://openmetrics.io
Language: Go
License: Apache-2.0
License Family: permissive
Last push: 2026-07-19T16:08:48+00:00

## Health v2 (maintenance only)
Score: 65/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 93, release rhythm 8, longevity 100
- inputs: {"age_days": 3359, "days_push": 45, "days_rel": 643, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2535, forks 176 (observed 2026-08-28T04:06:59.133173+00:00)

## What it is
OpenMetrics is a specification that evolves the Prometheus exposition format into a vendor-neutral standard for exposing cloud-native metrics, supporting both text and Protocol Buffers representations. The repository hosts the spec, protobuf definitions, and the governance process for OpenMetrics 2.0 development.

## Use cases
- expose application metrics in a standard format for Prometheus scraping
- implement a metrics exposition endpoint compatible with OpenMetrics
- understand the differences between Prometheus and OpenMetrics formats
- contribute to or propose changes to the metrics exposition standard
- parse or generate OpenMetrics text or protobuf metric data

## When to choose
- you need to implement or validate metrics exposition against an open standard
- you are building monitoring tooling that consumes or produces Prometheus-compatible metrics
- you want to participate in shaping the OpenMetrics 2.0 specification

## When to avoid
- you just need a client library to instrument your app - use a Prometheus client instead
- you need a runnable metrics server rather than a specification
- you need full OpenTelemetry metrics semantics

## Facets
- artifact type: learning-resource
- maturity: active
- function: monitoring, serialization
- domain: monitoring, cloud-computing, apis
- platform: cross-platform
- tags: metrics, specification, prometheus, observability, cloud-native, cncf, protocol-buffers, devops

## Member repositories
- prometheus/OpenMetrics (main) score 65

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:59.133173+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:25:14.475652+00:00, confidence not recorded.
  - readme: https://github.com/prometheus/OpenMetrics (fetched 2026-08-28T04:06:59.133173+00:00, sha f74819ea331c)
  - homepage: https://openmetrics.io (fetched 2026-08-29T10:07:22.799952+00:00, sha 3ee42ab4286d)
- Data as of 2026-08-30T08:39:29.467469+00:00.