- Improved how the API server responds to **list** requests where the response format negotiates to Protobuf. List responses in Protobuf are marshalled one element at the time, drastically reducing memory needed to serve large collections. Streaming list responses can be disabled via the `StreamingCollectionEncodingToProtobuf` feature gate. ([#129407](https://github.com/kubernetes/kubernetes/pull/129407), [@serathius](https://github.com/serathius)) [SIG API Machinery, Apps, Architecture,...

- Added new functionality to the Go client code (`client-go`) library. The `List()` method for the metadata client allows enabling API streaming when fetching collections; this improves performance when listing many objects.

- 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]

## 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]

## Changelog since v1.29.7

## Changes by Kind

### API Change

- Fixed a bug in the API server where empty collections of ValidatingAdmissionPolicies did not have an `items` field. ([#126157](https://github.com/kubernetes/kubernetes/pull/126157), [@xyz-li](https://github.com/xyz-li)) [SIG API Machinery]

## Changelog since v1.28.12

## Changes by Kind

### API Change

- Fixed a bug in the API server where empty collections of ValidatingAdmissionPolicies did not have an `items` field. ([#126159](https://github.com/kubernetes/kubernetes/pull/126159), [@xyz-li](https://github.com/xyz-li)) [SIG API Machinery]