* Add readyReplicas to replica sets ([#29481](https://github.com/kubernetes/kubernetes/pull/29481), [@kargakis](https://github.com/kargakis))

- Kubernetes is now built with go 1.21.11 ([#125369](https://github.com/kubernetes/kubernetes/pull/125369), [@cpanato](https://github.com/cpanato)) [SIG Release and Testing]

### Bug or Regression

- Improved scheduling latency when many gated pods ([#124866](https://github.com/kubernetes/kubernetes/pull/124866), [@gabesaba](https://github.com/gabesaba)) [SIG Scheduling and Testing]

  * Pods can now consume Secret data in environment variables and inject those
environment variables into a container’s command-line args.
  * Stable version of Heapster which scales up to 1000 nodes: more metrics, reduced
latency, reduced cpu/memory consumption (~4mb per monitored node).
  * Pods now have a security context which allows users to specify:
     * attributes which apply to the whole pod:
        * User ID

### Serverside Apply - Beta 2

identified in large-scale clusters when deleting thousands of pods simultaneously across hundreds of nodes. Kubelets in this scenario can encounter temporarily increased latency of `delete pod` API calls -- above the target service level objective of 1 second. If you run clusters with this usage pattern and if pod deletion latency could be an issue for you, you might want to wait until the issue is resolved before you upgrade.

For more information and for updates on resolution of this...

   *             cancelled the {@code Future}.
   *       </ol>
   *       Given all these possibilities, it is frequently possible for listeners to execute in UI
   *       threads, RPC network threads, or other latency-sensitive threads. In those cases, slow
   *       listeners can harm responsiveness, slow the system as a whole, or worse. (See also the
   *       note about locking below.)

- `kubelet` now emits a metric for end-to-end pod startup latency, including image pull. ([#121041](https://github.com/kubernetes/kubernetes/pull/121041), [@ruiwen-zhao](https://github.com/ruiwen-zhao))
- `kubelet` now exposes latency metrics of different stages of the node startup. ([#118568](https://github.com/kubernetes/kubernetes/pull/118568), [@qiutongs](https://github.com/qiutongs))

  1. For volumes provisioned/deleted via external provisioner/deleter, `storage_operation_duration_seconds` will NOT wait for the external operation to be done before reporting latency metric (effectively close to 0). This will be fixed by using `volum...

*   [beta] Flag `--chunk-size={SIZE}` is added to `kubectl get` to customize the number of results returned in large lists of resources. This reduces the perceived latency of managing large clusters because the server returns the first set of results to the client much more quickly. Pass 0 to disable this feature.([#53768](https://github.com/kubernetes/kubernetes/pull/53768),[ @smarterclayton](https://github.com/smarterclayton))...

- Fix: Azure file inline volume namespace issue in CSI migration translation ([#101235](https://github.com/kubernetes/kubernetes/pull/101235), [@andyzhangx](https://github.com/andyzhangx))