- Fix performance issue when creating large objects using SSA with fully unspecified schemas (preserveUnknownFields). ([#111915](https://github.com/kubernetes/kubernetes/pull/111915), [@aojea](https://github.com/aojea)) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Storage and Testing]

- Fixed nil pointer error in `NodeVolumeLimits` csi logging ([#115179](https://github.com/kubernetes/kubernetes/pull/115179), [@sunnylovestiramisu](https://github.com/sunnylovestiramisu))
- Fixed panic validating custom resource definition schemas that set `multipleOf` to 0 ([#114869](https://github.com/kubernetes/kubernetes/pull/114869), [@liggitt](https://github.com/liggitt))

- Added support for CEL(Common Expression Language) expressions and `additionalProperties` to be used under nested quantifiers in CRD schemas. ([#124381](https://github.com/kubernetes/kubernetes/pull/124381), [@alexzielenski](https://github.com/alexzielenski)) [SIG API Machinery]
- Added support for building Windows kube-proxy container image.

- Kube-apiserver: fixes a potential crash serving CustomResourceDefinitions that combine an invalid schema and CEL validation rules. ([#126167](https://github.com/kubernetes/kubernetes/pull/126167), [@cici37](https://github.com/cici37)) [SIG API Machinery and Testing]

- Kube-apiserver: openapi schemas published for custom resources now reference standard ListMeta schema definitions ([#92546](https://github.com/kubernetes/kubernetes/pull/92546), [@liggitt](https://github.com/liggitt)) [SIG API Machinery]

    <_comment>glob pattern typically *.xls</_comment>
  </mime-type>
  <mime-type type="application/vnd.ms-wordml">
    <root-XML localName="wordDocument" namespaceURI="http://schemas.microsoft.com/office/word/2003/wordml"/>
    <root-XML localName="wordDocument"/>
    <sub-class-of type="application/xml"/>
    <_comment>Word 2003 xml format, pre-ooxml</_comment>

## Changelog since v1.21.5

## Changes by Kind

### API Change

- Kube-apiserver: Fixes handling of CRD schemas containing literal null values in enums (#104989, @liggitt) [SIG API Machinery, Apps and Network]

### Feature

* Add port forwarding for rkt with kvm stage1 ([#32126](https://github.com/kubernetes/kubernetes/pull/32126), [@jjlakis](https://github.com/jjlakis))

nrstott, Nutti, Parag Jain, PeterLee, Philipp Jund, Rach L, Rafal Wojdyla,
Roland Zimmermann, Sergei Lebedev, SneakyFish5, Soila Kavulya, Sriram Veturi,
Steven Schmatz, Taehoon Lee, Tang, Wenyi, Taras Sereda, Ted Chang, Tim Zaman,
Tristan Rice, tucan, vchigrin, Vikram Tiwari, Vincent, WeberXie, William D.
Irons, Yan Facai (颜发才), Yong Tang, Yu Yi, Yuxin Wu, Zé ViníCius

# Release 1.9.0

* Eviction thresholds set to 0% or 100% will turn off eviction. ([#59681](https://github.com/kubernetes/kubernetes/pull/59681), [@mtaufen](https://github.com/mtaufen))

* CustomResourceDefinitions: OpenAPI v3 validation schemas containing `$ref`references are no longer permitted. Before upgrading, ensure CRD definitions do not include those `$ref` fields. ([#58438](https://github.com/kubernetes/kubernetes/pull/58438), [@carlory](https://github.com/carlory))