- The helping message of commands which have sub-commands is now clearer and more instructive. It will show the full command instead of `kubectl <command> --help ...`
  

- Kubeadm: fixed a bug during kubeadm upgrade, where it is not possible to mount a new device and create a symbolic link for /etc/kubernetes (or a sub-directory) so that kubeadm stores its information on the mounted device. ([#123406](https://github.com/kubernetes/kubernetes/pull/123406), [@SataQiu](https://github.com/SataQiu))

- Kubeadm: now supports image repository format validation. ([#112732](https://github.com/kubernetes/kubernetes/pull/112732), [@SataQiu](https://github.com/SataQiu))
- Kubeadm: sub-phases are now able to support the dry-run mode, e.g. kubeadm reset phase cleanup-node --dry-run ([#112945](https://github.com/kubernetes/kubernetes/pull/112945), [@chendave](https://github.com/chendave)) [SIG Cluster Lifecycle]

- `kubeadm`: fixed the bug where `--image-repository` flag is missing for some init
  phase sub-commands. ([#120072](https://github.com/kubernetes/kubernetes/pull/120072), [@SataQiu](https://github.com/SataQiu))