HandleBasic adds handlers to a mux for serving JSON etcd client requests that do not access the v2 store.

HandleMetricsHealth registers metrics and health handlers.

HandleMetricsHealthForV3 registers metrics and health handlers.

HandlePrometheus registers prometheus handler on '/metrics'.

NewHealthHandler handles '/health' requests.

NewPeerHandler generates an http.Handler to handle etcd peer requests.

WriteError logs and writes the given Error to the ResponseWriter If Error is an etcdErr, it is rendered to the ResponseWriter Otherwise, it is assumed to be a StatusInternalServerError.

Health defines etcd server health status.