The Kubernetes API server provides the /metrics endpoint, where it exposes a wealth of information about its performance in Prometheus format. But if you run a metrics collection system like Datadog, its agents are unable to collect that information. One reason is that they are expecting the Prometheus endpoints to be unauthenticated as do not provide any credentials to it. Another is that they are only able to collect information from endpoints exposed on the host they run on, and the cannot run on master nodes on Kubernetes clusters run by a cloud provider such as EKS.

This project scrapes Kubernetes API server's /metrics endpoint and re-publishes it without the need for authentication, so Datadog agents are able to access it.