endpoint for the kubelet when creating a cluster with "kubeadm init" or when joining control plane nodes with "kubeadm join".  The "kubeadm join" workflow now includes two new experimental phases called "control-plane-join-etcd" and "kubelet-wait-bootstrap" which will be used when the feature gate is enabled. This phases will be marked as non-experimental when ControlPlaneKubeletLocalMode becomes GA. During "kubeadm upgrade" commands, if the feature gate is enabled, modify the "/etc/kubernetes/kubelet.conf...

* Add authorization mode to kubeadm ([#39846](https://github.com/kubernetes/kubernetes/pull/39846), [@andrewrynhard](https://github.com/andrewrynhard))
* Refactor the certificate and kubeconfig code in the kubeadm binary into two phases ([#39280](https://github.com/kubernetes/kubernetes/pull/39280), [@luxas](https://github.com/luxas))

- If `kubeadm reset` finds no etcd member ID for the peer it removes during the `remove-etcd-member` phase, it continues immediately to other phases, instead of retrying the phase for up to 3 minutes before continuing. ([#118057](https://github.com/kubernetes/kubernetes/pull/118057), [@dlipovetsky](https://github.com/dlipovetsky)) [SIG Cluster Lifecycle]

- The commands `kubeadm alpha phases renew <cert-name>` have been added. ([#67910](https://github.com/kubernetes/kubernetes/pull/67910), [@liztio](https://github.com/liztio)) Courtesy of SIG API Machinery, and SIG Cluster Lifecycle

* Action Required: `kubeadm.k8s.io/v1beta1` has been deprecated, you should update your config to use newer non-deprecated API versions....

- kubeadm has graduated `kubeadm alpha phase` commands to `kubeadm init phase`. This means that the phases of creating a control-plane node are now tightly integrated as part of the `init` command. Alpha features, not yet ready for GA are still kept under `kubeadm alpha` and we appreciate feedback on them.

- If `kubeadm reset` finds no etcd member ID for the peer it removes during the `remove-etcd-member` phase, it continues immediately to other phases, instead of retrying the phase for up to 3 minutes before continuing. ([#117948](https://github.com/kubernetes/kubernetes/pull/117948), [@dlipovetsky](https://github.com/dlipovetsky)) [SIG Cluster Lifecycle]

* kubeadm: Add CoreDNS support for kubeadm "upgrade" and "alpha phases addons". ([#55952](https://github.com/kubernetes/kubernetes/pull/55952), [@rajansandeep](https://github.com/rajansandeep))

* kubeadm: rename the addon parameter `kube-dns` to `coredns` for `kubeadm alpha phases addons` as CoreDNS is now the default DNS server in 1.11. ([#64274](https://github.com/kubernetes/kubernetes/pull/64274), [@neolit123](https://github.com/neolit123))

- If `kubeadm reset` finds no etcd member ID for the peer it removes during the `remove-etcd-member` phase, it continues immediately to other phases, instead of retrying the phase for up to 3 minutes before continuing. ([#118192](https://github.com/kubernetes/kubernetes/pull/118192), [@dlipovetsky](https://github.com/dlipovetsky)) [SIG Cluster Lifecycle]