- Introducing new semantic for metric `volume_operation_total_seconds` to be the end to end latency of volume provisioning/deletion. Existing metric "storage_operation_duration_seconds" will remain untouched, however it is exposed to the following potential issues:

/proc/swaps on, set `--fail-swap-on=false`. The experimental flag `--experimental-fail-swap-on` is deprecated in this release, and will be removed in a future release.

* The `autoscaling/v2alpha1` API is now at `autoscaling/v2beta1`. However, the form of the API remains unchanged. Migrate the `HorizontalPodAutoscaler` resources to `autoscaling/v2beta1` to persist the `HorizontalPodAutoscaler` changes introduced in `autoscaling/v2alpha1`. The Horizontal Pod Autoscaler changes include support...

</pre>

<p>
Like arrays, slices are always one-dimensional but may be composed to construct
higher-dimensional objects.
With arrays of arrays, the inner arrays are, by construction, always the same length;
however with slices of slices (or arrays of slices), the inner lengths may vary dynamically.
Moreover, the inner slices must be initialized individually.
</p>

<h3 id="Struct_types">Struct types</h3>

<p>

- A new feature was enabled to improve the performance of the iptables mode of `kube-proxy` in large clusters. No action was required, however:
  

marterclayton))

* The behavior of some watch calls to the server when filtering on fields was incorrect. If watching objects with a filter, when an update was made that no longer matched the filter a DELETE event was correctly sent. However, the object that was returned by that delete was not the (correct) version before the update, but instead, the newer version. That meant the new object was not matched by the filter. This was a regression from behavior between cached watches on the...

* StorageClassName attribute has been added to PersistentVolume and PersistentVolumeClaim objects and should be used instead of annotation `volume.beta.kubernetes.io/storage-class`. The beta annotation is still working in this release, however it will be removed in a future release. ([#42128](https://github.com/kubernetes/kubernetes/pull/42128), [@jsafrane](https://github.com/jsafrane))

- Failed pods associated with a job with `parallelism = 1` are recreated by the job controller honoring exponential backoff delay again. However, for jobs with `parallelism > 1`, pods might be created without exponential backoff delay. ([#115022](https://github.com/kubernetes/kubernetes/pull/115022), [@nikhita](https://github.com/nikhita)) [SIG Apps]

* ReplicationController now shares its underlying controller implementation with ReplicaSet to reduce the maintenance burden going forward. However, they are still separate resources and there should be no externally visible effects from this change. ([#49429](https://github.com/kubernetes/kubernetes/pull/49429), [@enisoc](https://github.com/enisoc))

  - Added validation to enforce the hugepage aggregated container limits to be smaller than or equal to pod-level limits. This was already enforced with the defaulted requests from the specified limits, however it did not make it clear about both hugepage requests and limits. ([#131089](https://github.com/kubernetes/kubernetes/pull/131089), [@KevinTMtz](https://github.com/KevinTMtz)) [SIG Apps, Node and Testing]

- The `apiserver_request_total` metric is promoted to stable status and no longer has a content-type dimensions, so any alerts/charts which presume the existence of this will fail. This is however, unlikely to be the case since it was effectively an unbounded dimension in the first place. ([#99788](https://github.com/kubernetes/kubernetes/pull/99788), [@logicalhan](https://github.com/logicalhan))