# apiextensions-apiserver Implements https://github.com/kubernetes/community/blob/master/contributors/design-proposals/thirdpartyresources.md It provides an API for registering `CustomResourceDefinitions`. ## Purpose This API server provides the implementation for `CustomResourceDefinitions` which is included as delegate server inside of `kube-apiserver`. ## Compatibility HEAD of this repo will match HEAD of k8s.io/apiserver, k8s.io/apimachinvery, and k8s.io/client-go. ## Where does it come from? `apiextensions-apiserver` is synced from https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/apiextensions-apiserver. Code changes are made in that location, merged into `k8s.io/kubernetes` and later synced here.