- Removed local etcd members from the etcd cluster when `kubeadm reset` ([#74112](https://github.com/kubernetes/kubernetes/pull/74112), [@pytimer](https://github.com/pytimer))

* kubeadm: fix the bug that "--cri-socket" flag does not work for `kubeadm reset` ([#79498](https://github.com/kubernetes/kubernetes/pull/79498), [@SataQiu](https://github.com/SataQiu))

#### kube-controller-manager:
- Azure service annotation service.beta.kubernetes.io/azure-load-balancer-disable-tcp-reset has been deprecated. Its support would be removed in a future release. ([#88462](https://github.com/kubernetes/kubernetes/pull/88462), [@feiskyer](https://github.com/feiskyer)) [SIG Cloud Provider]

#### kubelet:

- `kubeadm join --experimental-control-plane` now automatically adds a new etcd member for `local etcd` mode, further simplifying required tasks for HA clusters setup.
- Improvements were made to `kubeadm reset` related to cleaning  etcd and notifying the user about the state of iptables.
- kubeadm commands now print warnings if input YAML documents contain unknown or duplicate fields.

- kubeadm reset: unmount directories under `/var/lib/kubelet` for Linux only ([#81494](https://github.com/kubernetes/kubernetes/pull/81494), [@Klaven](https://github.com/Klaven))
- kubeadm: fix the bug that `--cri-socket` flag does not work for `kubeadm reset` ([#79498](https://github.com/kubernetes/kubernetes/pull/79498), [@SataQiu](https://github.com/SataQiu))

- kubeadm: Added better handling of errors during unmount when calling `kubeadm reset`. When failing to unmount directories under `/var/run/kubelet`, kubeadm will now throw an error instead of showing a warning and continuing to clean up said directory. In such situations, it is better for you to inspect the problem and resolve it manually. Then, you can call `kubeadm reset` again to complete the cleanup.

- kubeadm: when adding new control plane nodes with `kubeamd join`, ensure that the etcd member addition is performed only if a given member URL does not already exist in the list of members. Similarly, on "kubeadm reset" only remove an etcd member if its ID exists. ([#127491](https://github.com/kubernetes/kubernetes/pull/127491), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

* kubeadm: reset: use crictl to reset containers ([#54721](https://github.com/kubernetes/kubernetes/pull/54721), [@runcom](https://github.com/runcom))

- Kubeadm ensures "kubeadm reset" does not unmount the root "/var/lib/kubelet" directory if it is mounted by the user. ([#93702](https://github.com/kubernetes/kubernetes/pull/93702), [@thtanaka](https://github.com/thtanaka))

- Kubeadm: prevent potential hanging of commands such as "kubeadm reset" if the apiserver endpoint is not reachable. ([#84648](https://github.com/kubernetes/kubernetes/pull/84648), [@neolit123](https://github.com/neolit123))