It provides
HEAD of this repo will match HEAD of k8s.io/apiserver, k8s.io/apimachinery, and k8s.io/client-go.
kube-proxy
is synced from https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/kube-proxy.
Code changes are made in that location, merged into k8s.io/kubernetes
and later synced here.