# Observability reference

Reference pages for Observability, listing every metric with its unit and meaning, the metrics query arguments, limits, and errors.

The reference pages list everything Observability exposes, so you can look up an exact name, argument, or limit. For how metrics work, see [What is Origin Cloud Observability?](/docs/observability).

## Pages [#pages]

| Page | What it lists |
| --- | --- |
| [Metrics](/docs/observability/reference/metrics) | Every metric with its resource type, unit, and what `RATE` and `INCREASE` mean for it, plus the `observability.metrics` query arguments, response fields, limits, and errors. See [Metrics reference](/docs/observability/reference/metrics). |

## Related references [#related-references]

- [Errors](/docs/platform/reference/errors) – every error code the API returns.
- [Price list API](/docs/pricing/reference/price-list-api) – the rates for metric queries and collected values.