### Feature

- A new client side metric `rest_client_request_retries_total` has been added that tracks the number of retries sent to the server, partitioned by status code, verb and host ([#108396](https://github.com/kubernetes/kubernetes/pull/108396), [@tkashem](https://github.com/tkashem))

  // Time when this Event was first observed.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.MicroTime eventTime = 10;

  // Data about the Event series this event represents or nil if it's a singleton Event.
  // +optional
  optional EventSeries series = 11;

  // What action was taken/failed regarding to the Regarding object.
  // +optional
  optional string action = 12;

- Promoting `WindowsHostProcessContainers` to stable. ([#113476](https://github.com/kubernetes/kubernetes/pull/113476), [@marosset](https://github.com/marosset))
- Scheduler now retries updating a pod's status on `ServiceUnavailable` and `InternalError` errors, in addition to `net.ConnectionRefused` error. ([#111809](https://github.com/kubernetes/kubernetes/pull/111809), [@Huang-Wei](https://github.com/Huang-Wei))

        * `{WorkQueueName}_retries`
    * Please convert to the following metrics:
        * `workqueue_depth`
        * `workqueue_adds_total`
        * `workqueue_queue_latency_seconds`
        * `workqueue_work_duration_seconds`
        * `workqueue_unfinished_work_seconds`
        * `workqueue_longest_running_processor_seconds`
        * `workqueue_retries_total`

* Fix a bug that prevents client-go metrics from being registered in prometheus in multiple components. ([#53434](https://github.com/kubernetes/kubernetes/pull/53434), [@crassirostris](https://github.com/crassirostris))
* Webhook always retries connection reset error. ([#53947](https://github.com/kubernetes/kubernetes/pull/53947), [@crassirostris](https://github.com/crassirostris))

* Bound cloud allocator to 10 retries with 100 ms delay between retries. ([#61375](https://github.com/kubernetes/kubernetes/pull/61375), [@satyasm](https://github.com/satyasm))

*   Fixed a bug so that the service controller no longer retries if doNotRetry service update fails. ([#54184](https://github.com/kubernetes/kubernetes/pull/54184),[ @MrHohn](https://github.com/MrHohn))

- Ubuntu 18.04 (Bionic) series has been added to Juju charms ([#65644](https://github.com/kubernetes/kubernetes/pull/65644), [@tvansteenburgh](https://github.com/tvansteenburgh))

- `scheduler`: handling of unschedulable pods because a `ResourceClass` is missing
  is a bit more efficient and no longer relies on periodic retries. ([#120213](https://github.com/kubernetes/kubernetes/pull/120213), [@pohly](https://github.com/pohly))

## Dependencies

### Added
- cloud.google.com/go/dataproc/v2: v2.0.1

  - If all QueueingHintFn return QueueSkip, it puts this pod back to the unschedulable pod pool
  
  Having appropriate QueueingHintFn contributes to reducing useless retries and thus improves the overall scheduler's performance.
  
  **How can I migrate?**
  
  For backward compatibility, nil `QueueingHintFn` is treated as always returning QueueAfterBackoff.