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### 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))

*   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))

* kubectl: improves compatibility with older servers when creating/updating API objects ([#61949](https://github.com/kubernetes/kubernetes/pull/61949), [@liggitt](https://github.com/liggitt))
* 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))

  - Serve from cache for the whole period of ongoing throttling
  - Fix unwanted VMSS VMs cache invalidations
  - Enforce setting the number of retries if cloud provider backoff is enabled
  - Don't update capacity if VMSS provisioning state is updating
  - Support allocatable resources overrides via VMSS tags
  - Add missing stable labels in template nodes

* 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))

* 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))

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

  - 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. 

- Kubeadm increased to 5 minutes its timeout for the TLS bootstrapping process to complete upon join ([#89735](https://github.com/kubernetes/kubernetes/pull/89735), [@rosti](https://github.com/rosti)) [SIG Cluster Lifecycle]
- Kubeadm: Add retries for kubeadm join / UpdateStatus to make update status more resilient by adding a retry loop to this operation ([#91952](https://github.com/kubernetes/kubernetes/pull/91952), [@xlgao-zju](https://github.com/xlgao-zju)) [SIG Cluster Lifecycle]