cloud-controller-manager has been deprecated, and will be removed in a future release. Use `--secure-port` and `--bind-address` instead. ([#59582](https://github.com/kubernetes/kubernetes/pull/59582), [@sttts](https://github.com/sttts))

* The ability to use the insecure flags `--insecure-bind-address`, `--insecure-port` in the apiserver has been deprecated and will be removed in a future release. Use `--secure-port` and `--bind-address` instead. ([#59018](https://github.com/kubernetes/kubernetes/pull/59018),...

### Feature

- Kubernetes is now built with Golang 1.16.9 (#105672, @cpanato) [SIG Cloud Provider, Instrumentation, Release and Testing]

### Failing Test

- Backport: e2e.test now uses the secure port to retrieve metrics data to ensure compatibility with 1.21 and 1.22 (for upgrade tests) (#104328, @pohly) [SIG API Machinery, Instrumentation, Storage and Testing]

### Bug or Regression

- Added `kubelet` Topology Manager metrics to track admission requests processed and occured admission errors. ([#115137](https://github.com/kubernetes/kubernetes/pull/115137), [@swatisehgal](https://github.com/swatisehgal))

- Secure serving on port 10258 to cloud-controller-manager (configurable via `--secure-port`) is now enabled. Delegated authentication and authorization are to be configured using the same flags as for aggregated API servers. Without configuration, the secure port will only allow access to `/healthz`. ([#67069](https://github.com/kubernetes/kubernetes/pull/67069), [@sttts](https...

* kubeadm: kubelets in kubeadm clusters now disable the readonly port (10255). If you're relying on unauthenticated access to the readonly port, please switch to using the secure port (10250). Instead, you can now use ServiceAccount tokens when talking to the secure port, which will make it easier to get access to, for example, the `/metrics` endpoint of the kubelet, securely. ([#64187](https://github.com/kubernetes/kubernetes/pull/64187), [@luxas](https://github.com/luxas))...

#### kubectl:

- Kubeadm: reset raises warnings if it cannot delete folders ([#85265](https://github.com/kubernetes/kubernetes/pull/85265), [@SataQiu](https://github.com/SataQiu))

        * DaemonSet’s [selector](http://kubernetes.io/docs/user-guide/labels/#label-selectors) is now more general (supports set-based selector; it only supported
equality-based selector in 1.1).
  * Running against a secured etcd requires these flags to be passed to
kube-apiserver (instead of --etcd-config):
     * --etcd-certfile, --etcd-keyfile (if using client cert auth)
     * --etcd-cafile (if not using system roots)

- GCERegionalPersistentDisk feature is GA now! ([#70716](https://github.com/kubernetes/kubernetes/pull/70716), [@jingxu97](https://github.com/jingxu97))

* Disabling swagger ui by default on apiserver. Adding a flag that can enable it ([#23025](https://github.com/kubernetes/kubernetes/pull/23025), [@nikhiljindal](https://github.com/nikhiljindal))
* restore ability to run against secured etcd ([#21535](https://github.com/kubernetes/kubernetes/pull/21535), [@AdoHe](https://github.com/AdoHe))

### Other notable changes