Remove kube-rbac-proxy

[Haishi2016]

New Kubebuilder / controller-runtime supports securing metrics directly.

Use:

mgr, err := ctrl.NewManager(cfg, ctrl.Options{
Metrics: server.Options{
BindAddress: ":8443",
SecureServing: true,
// authentication + authorization
},
})

This uses controller-runtime’s WithAuthenticationAndAuthorization metrics server, replacing the proxy sidecar.

Benefits

• no sidecar container
• fewer manifests
• officially recommended
• works with new Kubernetes versions

👉 This is what Kubebuilder scaffolds now.