Flag --logtostderr has been deprecated, will be removed in a future release, see https://github.com/kubernetes/enhancements/tree/master/keps/sig-instrumentation/2845-deprecate-klog-specific-flags-in-k8s-components
I0421 03:54:48.159726       1 kube-rbac-proxy.go:285] Valid token audiences: 
I0421 03:54:48.159797       1 kube-rbac-proxy.go:399] Reading certificate files
I0421 03:54:48.160122       1 kube-rbac-proxy.go:447] Starting TCP socket on 0.0.0.0:8443
I0421 03:54:48.160280       1 kube-rbac-proxy.go:454] Listening securely on 0.0.0.0:8443