public void testSetCount_threeToThree_unsupported() {
    try {
      assertThreeToThree();
    } catch (UnsupportedOperationException tolerated) {
    }
  }

  // Unconditional setCount size increases:

  @CollectionFeature.Require(SUPPORTS_ADD)
  public void testSetCount_zeroToOne_supported() {
    assertSetCount(e3(), 1);
  }

- Introduce `v1beta3` API for scheduler. This version 
  - increases the weight of user specifiable priorities.
  The weights of following priority plugins are increased
    - `TaintTolerations` to 3 - as leveraging node tainting to group nodes in the cluster is becoming a widely-adopted practice
    - `NodeAffinity` to 2

* Increase Horizontal Pod Autoscaler default update interval (30s -> 15s). It will improve HPA reaction time for metric changes. ([#68021](https://github.com/kubernetes/kubernetes/pull/68021), [@krzysztof-jastrzebski](https://github.com/krzysztof-jastrzebski))

 - Windows containers  now honor CPU limits
 - Performance improvements for collections of metrics and summary

### Increase the Kubernetes support window to one year

As of Kubernetes 1.19, bugfix support via patch releases for a Kubernetes minor release has increased from 9 months to 1 year.

  public void testSetCount_threeToThree_unsupported() {
    try {
      assertThreeToThree();
    } catch (UnsupportedOperationException tolerated) {
    }
  }

  // Unconditional setCount size increases:

  @CollectionFeature.Require(SUPPORTS_ADD)
  public void testSetCount_zeroToOne_supported() {
    assertSetCount(e3(), 1);
  }

Applications expected to be installed on older Android devices should consider adopting the
[Google Play Services’ ProviderInstaller][provider_installer]. This will increase security for users
and increase connectivity with web servers.

### Certificate Pinning ([.kt][CertificatePinningKotlin], [.java][CertificatePinningJava])

* [alpha] Volume resizing

  * You can now increase the size of a volume by calling the Kubernetes API.

  * For alpha, this feature increases only the size of the underlying volume. It does not support resizing the file system.

  * For alpha, volume resizing supports only Gluster volumes.

* kubeadm - Increase the manifest upgrade timeout to make upgrades more reliable. ([#65029](https://github.com/kubernetes/kubernetes/pull/65029), [@detiber](https://github.com/detiber))
* Webhooks for the mutating admission controller now support "remove" operation. ([#64971](https://github.com/kubernetes/kubernetes/pull/64971), [@sttts](https://github.com/sttts))

   * rate, and ability to be implemented with O(1) time complexity. The initial LRU implementation
   * operates per-segment rather than globally for increased implementation simplicity. We expect
   * the cache hit rate to be similar to that of a global LRU algorithm.
   */

  // Constants

  /**

- Included the namespace in the output of `kubectl delete` for better identification of resources. ([#126619](https://github.com/kubernetes/kubernetes/pull/126619), [@totegamma](https://github.com/totegamma))
- Increased APF max seats to 100 for LIST requests. ([#133034](https://github.com/kubernetes/kubernetes/pull/133034), [@serathius](https://github.com/serathius))