- Different configuration types can be supplied all in the same file separated by `---`.
- Improved CRI handling
  - crictl is no longer required in docker-only setups.
  - Better detection of installed CRI.
  - Better output for image pull errors.
- Improved air-gapped and offline support
  - kubeadm now handles air-gapped environments by using the local client version as a fallback.

## Changelog since v1.16.7

## Changes by Kind

### API Change

- Fixes a regression with clients prior to 1.15 not being able to update podIP in pod status, or podCIDR in node spec, against >= 1.16 API servers ([#88505](https://github.com/kubernetes/kubernetes/pull/88505), [@liggitt](https://github.com/liggitt)) [SIG Apps and Network]

### Other (Bug, Cleanup or Flake)

- API priority and fairness graduated to beta. 1.19 servers with APF turned on should not be run in a multi-server cluster with 1.20+ servers. ([#96527](https://github.com/kubernetes/kubernetes/pull/96527), [@adtac](https://github.com/adtac)) [SIG API Machinery and Testing]

  Users should update import path for these types from `k8s.io/kubernetes/pkg/scheduler/framework` to `k8s.io/kube-scheduler/framework` and update use of fields (to use getter/setter functions instead) where needed. ([#132457](https://github.com/kubernetes/kubernetes/pull/132457), [@ania-borowiec](https://github.com/ania-borowiec)) [SIG Node, Scheduling, Storage and Testing]

- The getters for the field name and typeDescription of the Reflector struct were renamed. ([#128035](https://github.com/kubernetes/kubernetes/pull/128035), [@alexanderstephan](https://github.com/alexanderstephan)) [SIG API Machinery]

* Fix a bug in server printer that could cause kube-apiserver to panic. ([#79349](https://github.com/kubernetes/kubernetes/pull/79349), [@roycaihw](https://github.com/roycaihw))
* Fix a bug in the IPVS proxier where virtual servers are not cleaned up even though the corresponding Service object was deleted. ([#80942](https://github.com/kubernetes/kubernetes/pull/80942), [@gongguan](https://github.com/gongguan))

### Bug or Regression

- Fixed a bug where clusters that use KMS v1 with skewed API servers on versions v1.24 and v1.25 would see internal errors when attempting to read encrypted data via the v1.24 API servers. ([#119387](https://github.com/kubernetes/kubernetes/pull/119387), [@enj](https://github.com/enj)) [SIG API Machinery and Auth]

## Dependencies

### Added

<h3 id="Identifiers">Identifiers</h3>

<p>
Identifiers name program entities such as variables and types.
An identifier is a sequence of one or more letters and digits.
The first character in an identifier must be a letter.
</p>
<pre class="ebnf">
identifier = letter { letter | unicode_digit } .
</pre>
<pre>
a
_x9
ThisVariableIsExported
αβ
</pre>

<p>

- Kube-apiserver: redirects from backend API servers are no longer followed when checking availability with requests to `/apis/$group/$version` ([#112772](https://github.com/kubernetes/kubernetes/pull/112772), [@liggitt](https://github.com/liggitt)) [SIG API Machinery and Testing]

  
  Multi vCenter support is deprecated as of v1.21. If you have a Kubernetes cluster spanning across multiple vCenter servers, please consider moving all k8s nodes to a single vCenter Server. vSphere CSI Driver does not support Kubernetes deployment spanning across multiple vCenter servers.