W0421 00:51:50.259079       1 deprecated.go:66] 
==== Removed Flag Warning ======================

logtostderr is removed in the k8s upstream and has no effect any more.

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I0421 00:51:50.259766       1 kube-rbac-proxy.go:235] Valid token audiences: 
I0421 00:51:50.262382       1 kube-rbac-proxy.go:349] Reading certificate files
I0421 00:51:50.262763       1 kube-rbac-proxy.go:397] Starting TCP socket on :9154
I0421 00:51:50.263035       1 kube-rbac-proxy.go:404] Listening securely on :9154