Add healthz check to ensure logging is not blocked

pkg/kubelet/server/server.go

@@ -256,6 +256,7 @@ func (s *Server) InstallAuthFilter() {
 func (s *Server) InstallDefaultHandlers() {
 	healthz.InstallHandler(s.restfulCont,
 		healthz.PingHealthz,
+		healthz.LogHealthz,
 		healthz.NamedCheck("syncloop", s.syncLoopHealthCheck),
 	)
 	ws := new(restful.WebService)