- Implemented API streaming for the `watch-cache`
  
  When `sendInitialEvents` `ListOption` is set together with `watch=true`, it begins the watch stream with synthetic init events followed by a synthetic "Bookmark" after which the server continues streaming events. ([#110960](https://github.com/kubernetes/kubernetes/pull/110960), [@p0lyn0mial](https://github.com/p0lyn0mial))
- Introduced API for streaming.
  

## Changelog since v1.8.1

### Other notable changes

* Allow for configuring etcd hostname in the manifest ([#54403](https://github.com/kubernetes/kubernetes/pull/54403), [@wojtek-t](https://github.com/wojtek-t))
* Allow standard flags in client-gen. ([#53999](https://github.com/kubernetes/kubernetes/pull/53999), [@sttts](https://github.com/sttts))

- Allow to monitor client-go DNS resolver latencies via `rest_client_dns_resolution_duration_seconds` Prometheus metric. ([#115357](https://github.com/kubernetes/kubernetes/pull/115357), [@mfojtik](https://github.com/mfojtik))

- 'Promoted `cronjob_job_creation_skew` metric to stable to follow the cronjob v2 controller,
  the following metrics had their name updated to match metrics API guidelines:
    - `cronjob_job_creation_skew_duration_seconds` -> `job_creation_skew_duration_seconds`.' ([#113008](https://github.com/kubernetes/kubernetes/pull/113008), [@soltysh](https://github.com/soltysh))

- DRA: ResourceClaim and PodSchedulingContext status updates no longer allow changing object meta data. ([#123730](https://github.com/kubernetes/kubernetes/pull/123730), [@pohly](...

- Allow-list of metric labels can be configured by supplying a manifest using the --allow-metric-labels-manifest flag ([#118299](https://github.com/kubernetes/kubernetes/pull/118299), [@rexagod](https://github.com/rexagod)) [SIG Architecture and Instrumentation]