- kubeadm: added the `WaitForAllControlPlaneComponents` feature gate. It could be used to tell kubeadm to wait for all control plane components to be ready when running "kubeadm init" or "kubeadm join --control-plane". Previously, kubeadm only waited for the kube-apiserver. The "kubeadm join" workflow now includes a new experimental phase called "wait-control-plane". This phase was marked as non-experimental...

Executing `kubeadm init phase kubeconfig all` or just `kubeadm init` will now generate the new `super-admin.conf` file. The cluster admin can then decide to keep the file present on a node host or move it to a safe location. `kubadm certs renew` will renew the certificate in `super-admin.conf` to one year if the file exists; if it does not exist a "MISSING" note will be printed. `kubeadm upgrade apply` for this release will migrate this particular node to the two file setup. Subsequent kubeadm releases...

- Kubeadm: fixed an etcd learner-mode bug by preparing an etcd static pod manifest before promoting ([#115038](https://github.com/kubernetes/kubernetes/pull/115038), [@tobiasgiese](https://github.com/tobiasgiese))

- Kubeadm: add `--feature-gates` flag for `kubeadm upgrade node` ([#118316](https://github.com/kubernetes/kubernetes/pull/118316), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]