> For the complete documentation index, see [llms.txt](https://docs.deltastream.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.deltastream.io/reference/metrics.md).

# Metrics

- [Prometheus Integration](https://docs.deltastream.io/reference/metrics/prometheus-integration.md): Add DeltaStream metrics endpoint as a Prometheus Metrics Endpoint
- [Built-In Metrics](https://docs.deltastream.io/reference/metrics/built-in-metrics.md): Default deltastream query metrics provided by Prometheus integration
- [Custom Metrics in Functions](https://docs.deltastream.io/reference/metrics/custom-metrics-in-functions.md)