* Fix public IP not found issues for VMSS nodes ([#80703](https://github.com/kubernetes/kubernetes/pull/80703), [@feiskyer](https://github.com/feiskyer))
* Resolves a bug that prevented sending a multi-version custom resource to an admission webhook. ([#79495](https://github.com/kubernetes/kubernetes/pull/79495), [@liggitt](https://github.com/liggitt))

## Changelog since v1.16.9

## Changes by Kind

### API Change
 - Fix bug where sending a status update completely wipes managedFields for some types. ([#90033](https://github.com/kubernetes/kubernetes/pull/90033), [@apelisse](https://github.com/apelisse)) [SIG API Machinery and Testing]

### Bug or Regression

- Duplicate owner reference entries in create/update/patch requests now get deduplicated by the API server. The client sending the request now receives a warning header in the API response. Clients should stop sending requests with duplicate owner references. The API server may reject such requests as early as 1.24. ([#96185](https://github.com/kubernetes/kubernetes/pull/96185), [@roycaihw](https://github.com/roycaihw))...

* Fix race condition in setting node statusUpdateNeeded flag  ([#32807](https://github.com/kubernetes/kubernetes/pull/32807), [@jingxu97](https://github.com/jingxu97))
* Fix the DOCKER_OPTS appending bug. ([#33163](https://github.com/kubernetes/kubernetes/pull/33163), [@DjangoPeng](https://github.com/DjangoPeng))

- In clusters where the DryRun feature is enabled,...

*   Webhooks now always retry sending if a connection reset error is returned. ([#53947](https://github.com/kubernetes/kubernetes/pull/53947),[ @crassirostris](https://github.com/crassirostris))

#### **Custom Resources**

## Changelog since v1.17.5

## Changes by Kind

### API Change
 - Fix bug where sending a status update completely wipes managedFields for some types. ([#90032](https://github.com/kubernetes/kubernetes/pull/90032), [@apelisse](https://github.com/apelisse)) [SIG API Machinery and Testing]

### Bug or Regression

- Try to send watch bookmarks (if requested) periodically in addition to sending them right before timeout ([#90560](https://github.com/kubernetes/kubernetes/pull/90560), [@wojtek-t](https://github.com/wojtek-t)) [SIG API Machinery]

* Fixes a bug in openapi published for custom resources using x-kubernetes-preserve-unknown-fields extensions, so that kubectl will allow sending unknown fields for that portion of the object. ([#79636](https://github.com/kubernetes/kubernetes/pull/79636), [@liggitt](https://github.com/liggitt))

* Fixes an issue with upgrade requests made via pod/service/node proxy subresources sending a non-absolute HTTP request-uri to backends ([#52065](https://github.com/kubernetes/kubernetes/pull/52065), [@liggitt](https://github.com/liggitt))