- Dropped support for the Container Runtime Interface (CRI) version `v1alpha2`, which means that container runtimes just have to implement `v1`. ([#110618](https://github.com/kubernetes/kubernetes/pull/110618), [@saschagrunert](https://github.com/saschagrunert))

  metrics with "iptables" in their names. ([#124557](https://github.com/kubernetes/kubernetes/pull/124557), [@danwinship](https://github.com/danwinship)) [SIG Network and Windows]
- Allowed calling Stop multiple times on RetryWatcher without panicking. ([#126125](https://github.com/kubernetes/kubernetes/pull/126125), [@mprahl](https://github.com/mprahl))

- Kubeadm: perform additional dockershim cleanup. Treat all container runtimes as remote by using the flag "--container-runtime=remote", given dockershim was removed in 1.24 and given kubeadm 1.25 supports a kubelet version of 1.24 and 1.25. The flag "--network-plugin" will no longer be used for new clusters. Stop cleaning...

* Update Azure load balancer to prevent orphaned public IP addresses ([#82890](https://github.com/kubernetes/kubernetes/pull/82890), [@chewong](https://github.com/chewong))
* Fixes a goroutine leak in kube-apiserver when a request times out. ([#83333](https://github.com/kubernetes/kubernetes/pull/83333), [@lavalamp](https://github.com/lavalamp))

## Changelog since v1.19.0

## What's New (Major Themes)

### Dockershim deprecation

Docker as an underlying runtime is being deprecated. Docker-produced images will continue to work in your cluster with all runtimes, as they always have.

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