* Action required: validation rule on metadata.initializers.pending[x].name is tightened. The initializer name needs to contain at least three segments separated by dots. If you create objects with pending initializers, (i.e., not relying on apiserver adding pending initializers according to initializerconfiguration), you need to update the initializer name in existing objects and in configuration files to comply to the new validation rule. ([#51283](https://github....

* Bugfix: OpenAPI models may not get group-version-kind extension if kubernetes is vendored in another project (e.g. minikube). Kubectl 1.8 needs this extension to work with those projects. ([#53152](https://github.com/kubernetes/kubernetes/pull/53152), [@mbohlool](https://github.com/mbohlool))

 - [Action Required] CSI drivers that call IsLikelyNotMountPoint should not assume false means that the path is a mount point. Each CSI driver needs to make sure correct usage of return value of IsLikelyNotMountPoint because if the file is an irregular file but not a mount point is acceptable ([#129370](https://github.com/kubernetes/kubernetes/pull/129370), [@andyzhangx](https://github.com/andyzhangx))...

- Online volume expansion (ExpandInUsePersistentVolumes) is now a beta feature. As such, it is...

- Kube-scheduler removed...

beginning to see its meaning.

  `And just as I'd taken the highest tree in the wood,' continued
the Pigeon, raising its voice to a shriek, `and just as I was
thinking I should be free of them at last, they must needs come
wriggling down from the sky!  Ugh, Serpent!'

  `But I'm NOT a serpent, I tell you!' said Alice.  `I'm a--I'm
a--'

  `Well!  WHAT are you?' said the Pigeon.  `I can see you're

- kube-scheduler

  - Migrate scheduler to use v1beta1 Event API. any tool targeting scheduler events needs to use v1beta1 Event API ([#78447](https://github.com/kubernetes/kubernetes/pull/78447), [@yastij](https://github.com/yastij))

- kubeadm

  - The CoreDNS Deployment now checks readiness via the `ready` plugin.

    * If you have to use the legacy in-tree cloud providers, you can rearrange your config like the example below. In case you need the `cloud-config` file (located in `{cloud-config-path}`), you can mount it into the API Server and controller-manager containers using ExtraVolumes like the example below.

### Other (Cleanup or Flake)

- Track the number of Pods with a Ready condition in Job status. The feature is alpha and needs the feature gate JobReadyPods to be enabled. ([#104915](https://github.com/kubernetes/kubernetes/pull/104915), [@alculquicondor](https://github.com/alculquicondor))