- Fixed a bug that caused apiservers to send an inappropriate Content-Type request header to authorization, token authentication, imagepolicy admission, and audit webhooks when the alpha client-go feature gate "ClientsPreferCBOR" is enabled. ([#132960](https://github.com/kubernetes/kubernetes/pull/132960),...

  - If all QueueingHintFn return QueueSkip, it puts this pod back to the unschedulable pod pool
  
  Having appropriate QueueingHintFn contributes to reducing useless retries and thus improves the overall scheduler's performance.
  
  **How can I migrate?**
  

* If a non-absolute mountPath is passed to the kubelet, prefix it with the appropriate root path. ([#55665](https://github.com/kubernetes/kubernetes/pull/55665), [@brendandburns](https://github.com/brendandburns))

    *   If a non-absolute mountPath is passed to the kubelet, it must now be prefixed with the appropriate root path. ([#55665](https://github.com/kubernetes/kubernetes/pull/55665),[ @brendandburns](https://github.com/brendandburns))

## External Dependencies

- Added to `MutableFeatureGate` the ability to override the default setting of feature...

`wait.Poll*` and `wait.ExponentialBackoff*` functions have been deprecated and will be removed in a future release.  Callers should switch to using `wait.PollUntilContextCancel`, `wait.PollUntilContextTimeout`, or `wait.ExponentialBackoffWithContext` as appropriate.
  
  `PollWithContext(Cancel|Deadline)` will no longer return `ErrWaitTimeout` - use the `Interrupted(error) bool` helper to replace checks for `err == ErrWaitTimeout`, or compare specifically to context errors as needed. A future release...

- Windows worker nodes in a Kubernetes cluster now support Windows Server version 1903 in addition to the existing support for Windows Server 2019
- The RuntimeClass scheduler can now simplify steering Linux or Windows pods to appropriate nodes
- All Windows nodes now get the new label `node.kubernetes.io/windows-build` that reflects the Windows major, minor, and build number that are needed to match compatibility between Windows containers and Windows worker nodes.

- Improved scheduler robustness to ensure that unschedulable pods are reconsidered for scheduling when appropriate. ([#73700](https://github.com/kubernetes/kubernetes/pull/73700), [#72558](https://github.com/kubernetes/kubernetes/pull/72558), [@denkensk](https://github.com/denkensk), [#73078](https://github.com/kubernetes/kubernetes/pull/73078), [@Huang-Wei...

- Shell completion now shows plugin names when appropriate. Furthermore, shell completion will work for plugins that provide such support. ([#105867](https://github.com/kubernetes/kubernetes/pull/105867), [@marckhouzam](https://github.com/marckhouzam))

## **External Dependency Version Information**

Continuous integration builds have used the following versions of external dependencies, however, this is not a strong recommendation and users should consult an appropriate installation or upgrade guide before deciding what versions of etcd, docker or rkt to use.

* Docker versions 1.10.3, 1.11.2, 1.12.6 have been validated

    * Docker version 1.12.6 known issues