e0fdee6b0d
[kubelet has client and server certificates](https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet-tls-bootstrapping/#client-and-serving-certificates). But this page only mentions kubelet client certificate. I linked to the [page](https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet-tls-bootstrapping/#client-and-serving-certificates) because I couldn't find the doc about what are those `certain features`. Please suggest a better link if there are any.