vSphere releases less than 67u3 are deprecated as of v1.21. Please consider upgrading vSphere to 67u3 or above. vSphere CSI Driver requires minimum vSphere 67u3.
  

* Adds a new `kubeadm config` command that lets users tell `kubeadm upgrade` what kubeadm configuration to use and lets users view the current state. ([#50980](https://github.com/kubernetes/kubernetes/pull/50980), [@luxas](https://github.com/luxas))

* Fix in vSphere Cloud Provider to handle upgrades from kubernetes version less than v1.9.4 to v1.9.4 and above. ([#62919](https://github.com/kubernetes/kubernetes/pull/62919), [@abrarshivani](https://github.com/abrarshivani))

 
## Changes by Kind

### Deprecation

* Disabled ScheduleDaemonSetPods if kubelet version less than 1.11; and ScheduleDaemonSetPods is not supported on a 1.13 control plane / 1.10 kubelet split. ([#69566](https://github.com/kubernetes/kubernetes/pull/69566), [@k82cn](https://github.com/k82cn))

      <match value="&lt;%--" type="string" offset="0"/>
    </magic>
    <glob pattern="*.jsp"/>
  </mime-type>

  <mime-type type="text/x-less">
    <_comment>LESS source code</_comment>
    <glob pattern="*.less"/>
    <sub-class-of type="text/plain"/>
  </mime-type>

  <mime-type type="text/x-lex">
    <_comment>Lex/Flex source code</_comment>
    <glob pattern="*.l"/>

support for a new kubectl output format, `kyaml`. KYAML was a strict subset of YAML and should be accepted by any YAML processor. The formatting of KYAML was halfway between JSON and YAML.  Because it was more explicit than the default YAML style, it was less error-prone. ([#132942](https://github.com/kubernetes/kubernetes/pull/132942), [@thockin](https://github.com/thockin)) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Contributor Experience, Instrumentation, Network,...

- Count pod overhead against an entity's ResourceQuota ([#99600](https://github.com/kubernetes/kubernetes/pull/99600), [@gjkim42](https://github.com/gjkim42)) [SIG API Machinery and Node]
- EndpointSlice controller is now less likely to emit FailedToUpdateEndpointSlices events. ([#100146](https://github.com/kubernetes/kubernetes/pull/100146), [@robscott](https://github.com/robscott)) [SIG Apps and Network]

* removed unsafe double RLock in cpumanager ([#62464](https://github.com/kubernetes/kubernetes/pull/62464), [@choury](https://github.com/choury))
* Fix in vSphere Cloud Provider to handle upgrades from kubernetes version less than v1.9.4 to v1.9.4 and above. ([#62919](https://github.com/kubernetes/kubernetes/pull/62919), [@abrarshivani](https://github.com/abrarshivani))

The StorageProtection feature, which prevents deletion of PVCs while Pods are still using them and of PVs while still bound to a PVC, is now generally available, and volume resizing, which lets you increase size of a volume after a Pod restarts is now beta, which means it is on by default.

New alpha features include: