# Prometheus Exposition Format / OpenMetrics

**Canonical:** https://apis.io/apis/prometheus-io/prometheus-exposition-format/  
**Provider:** Prometheus — https://apis.io/providers/prometheus-io/  
**Documentation:** https://prometheus.io/docs/instrumenting/exposition_formats/

Prometheus Exposition Format / OpenMetrics is one of 21 APIs that [Prometheus](https://apis.io/providers/prometheus-io/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Exposition, OpenMetrics, Scraping, and Metrics Format. The published artifact set on APIs.io includes API documentation.

The text-based exposition format that every instrumented target exposes (typically on /metrics) and that the Prometheus server scrapes over HTTP. The format evolved into OpenMetrics, a CNCF Sandbox specification that is the standardized successor; both are scrape-compatible with Prometheus. Defines counters, gauges, histograms, summaries, and (in OpenMetrics) info, stateset, gaugehistogram, and exemplars.

## Machine-readable artifacts (3)

- **Documentation** — https://prometheus.io/docs/instrumenting/exposition_formats/
- **Documentation** — https://openmetrics.io/
- **SourceCode** — https://github.com/prometheus/OpenMetrics

## Other Prometheus APIs (12)

- [Prometheus Remote Write](https://apis.io/apis/prometheus-io/prometheus-remote-write/)
- [Prometheus OTLP Metrics Receiver](https://apis.io/apis/prometheus-io/prometheus-otlp-receiver/)
- [Prometheus admin API](https://apis.io/apis/prometheus-io/prometheus-io-admin-api/)
- [Prometheus alert API](https://apis.io/apis/prometheus-io/prometheus-io-alert-api/)
- [Prometheus alertgroup API](https://apis.io/apis/prometheus-io/prometheus-io-alertgroup-api/)
- [Prometheus alerts API](https://apis.io/apis/prometheus-io/prometheus-io-alerts-api/)
- [Prometheus features API](https://apis.io/apis/prometheus-io/prometheus-io-features-api/)
- [Prometheus general API](https://apis.io/apis/prometheus-io/prometheus-io-general-api/)
- [Prometheus labels API](https://apis.io/apis/prometheus-io/prometheus-io-labels-api/)
- [Prometheus metadata API](https://apis.io/apis/prometheus-io/prometheus-io-metadata-api/)
- [Prometheus notifications API](https://apis.io/apis/prometheus-io/prometheus-io-notifications-api/)
- [Prometheus otlp API](https://apis.io/apis/prometheus-io/prometheus-io-otlp-api/)

## Tags

Exposition, OpenMetrics, Scraping, Metrics Format

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/prometheus-io/prometheus-exposition-format/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/prometheus-io/.