- Fixes a bug where `MutatingAdmissionPolicy` would fail to apply to objects with duplicate list items (like env vars). ([#135560](https://github.com/kubernetes/kubernetes/pull/135560), [@lalitc375](https://github.com/lalitc375) [SIG API Machinery]

## Changelog since v1.30.3

## Changes by Kind

### API Change

- Fixed a bug in the API server where empty collections of ValidatingAdmissionPolicies did not have an `items` field. ([#126146](https://github.com/kubernetes/kubernetes/pull/126146), [@xyz-li](https://github.com/xyz-li)) [SIG API Machinery]

* Add density (batch pods creation latency and resource) and resource performance tests to `test-e2e-node' built for Linux only ([#30026](https://github.com/kubernetes/kubernetes/pull/30026), [@coufon](https://github.com/coufon))
* Clean up items from moving local cluster setup guides ([#30035](https://github.com/kubernetes/kubernetes/pull/30035), [@pwittrock](https://github.com/pwittrock))

    /** The key of the message: FTP */
    public static final String LABELS_file_auth_scheme_ftp = "{labels.file_auth_scheme_ftp}";

    /** The key of the message: {0}/{1} ({2} items) */
    public static final String LABELS_pagination_page_guide_msg = "{labels.pagination_page_guide_msg}";

    /** The key of the message: Not registered. */

- The Kubernetes API server now correctly detects and closes existing TLS connections when its client...

- Fixed a bug in the API server where empty collections of ValidatingAdmissionPolicies did not have an `items` field. ([#124568](https://github.com/kubernetes/kubernetes/pull/124568), [@xyz-li](https://github.com/xyz-li)) [SIG API Machinery]

- CRDs: For structural schemas, non-nullable null map fields will now be dropped and defaulted if a default is available. null items in the list will continue being preserved, and fail validation if not nullable. ([#95423](https://github.com/kubernetes/kubernetes/pull/95423), [@apelisse](https://github.com/apelisse)) [SIG API Machinery]

- Fixed a rare race condition handling requests that timeout. ([#107452](https://github.com/kubernetes/kubernetes/pull/107452), [@liggitt](https://github.com/liggitt))
- Fixed a regression in 1.23 that incorrectly pruned data from array items of a custom resource that set `x-kubernetes-preserve-unknown-fields: true`. ([#107688](https://github.com/kubernetes/kubernetes/pull/107688), [@liggitt](https://github.com/liggitt))

* Fix share name generation in azure file provisioner. ([#48326](https://github.com/kubernetes/kubernetes/pull/48326), [@karataliu](https://github.com/karataliu))
* Fixed a bug where a jsonpath filter would return an error if one of the items being evaluated did not contain all of the nested elements in the filter query. ([#47846](https://github.com/kubernetes/kubernetes/pull/47846), [@ncdc](https://github.com/ncdc))

* Fix incorrectly propagated ResourceVersion in ListRequests returning 0 items. ([#64150](https://github.com/kubernetes/kubernetes/pull/64150), [@wojtek-t](https://github.com/wojtek-t))