> ### This feature is in beta
>
> To use this feature, pass in a header including the `LD-API-Version` key with value set to `beta`. Use this header with each call. To learn more, read [Beta resources](https://launchdarkly.com/docs/api#beta-resources).
>
> Resources that are in beta are still undergoing testing and development. They may change without notice, including becoming backwards incompatible.

The charts API provides access to the data used in engineering insights project metrics. To learn more, read [Project metrics](https://launchdarkly.com/docs/home/observability/project-metrics).