- `kube-apiserver` updated:

### DaemonSet
* **[beta]** Introduce the rolling update feature for DaemonSet. See [Performing a Rolling Update on a DaemonSet](https://kubernetes.io/docs/tasks/manage-daemon/update-daemon-set/).

### Deployment

* The `kubectl rolling-update` is now deprecated.  Use `kubectl rollout` instead.  ([#61285](https://github.com/kubernetes/kubernetes/pull/61285), [@soltysh](https://github.com/soltysh))

- Revised the logic for DaemonSet rolling update to exclude nodes if scheduling constraints are not met.

    * If your config files contains fields with wrong case, the config files will be now invalid.
* GCE: Fixes operation polling to adhere to the specified interval. Furthermore, operation errors are now returned instead of ignored. ([#64630](https://github.com/kubernetes/kubernetes/pull/64630), [@nicksardo](https://github.com/nicksardo))

An alternative implementation of the `CronJob` controller is now available as an alpha feature in this release, which has experimental performance improvement by using informers instead of polling. While this will be the default behavior in the future, you can [try them in this release through a feature gate](https://docs.k8s.io/concepts/workloads/controllers/cron-jobs/).

### PID Limits graduates to General Availability

- CoreDNS adds readinessProbe which prevents loadbalancing to unready pods, and also allows rolling updates to work as expected. ([#74137](https://github.com/kubernetes/kubernetes/pull/74137), [@rajansandeep](https://github.com/rajansandeep))

([#87077](https://github.com/kubernetes/kubernetes/pull/87077), [@soltysh](https://github.com/soltysh)) [SIG Architecture, CLI and Testing]
- The deprecated command `kubectl rolling-update` has been removed ([#88057](https://github.com/kubernetes/kubernetes/pull/88057), [@julianvmodesto](https://github.com/julianvmodesto)) [SIG Architecture, CLI and Testing]

#### client-go:

* [stable] Expose storage usage metrics

  * The available capacity of a given Persistent Volume (PV) is available by calling the Kubernetes metrics API.

* [stable] Volume plugin metrics

  * Success and latency metrics for all Kubernetes calls are available by calling the Kubernetes metrics API. You can request volume operations, including mount, unmount, attach, detach, provision, and delete.

	<code>A</code> must have all methods of <code>C</code>, if any,
	and corresponding method types must unify exactly.
</li>
</ul>

<p>
When solving type equations from type constraints,
solving one equation may infer additional type arguments,
which in turn may enable solving other equations that depend
on those type arguments.
Type inference repeats type unification as long as new type
arguments are inferred.
</p>