* Mark the LBaaS v1 of OpenStack cloud provider deprecated. ([#52821](https://github.com/kubernetes/kubernetes/pull/52821), [@FengyunPan](https://github.com/FengyunPan))
* Mark image as deliberately optional in v1 Container struct.  Many objects in the Kubernetes API inherit the container struct and only Pods require the field to be set. ([#48406](https://github.com/kubernetes/kubernetes/pull/48406), [@gyliu513](https://github.com/gyliu513))

* OpenStack cloud provider supports Cinder v3 API. ([#52910](https://github.com/kubernetes/kubernetes/pull/52910), [@FengyunPan](https://github.com/FengyunPan))
* kube-up: Add optional addon CoreDNS.  ([#55728](https://github.com/kubernetes/kubernetes/pull/55728), [@rajansandeep](https://github.com/rajansandeep))
    * Install CoreDNS instead of kube-dns by setting CLUSTER_DNS_CORE_DNS value to 'true'.

### Network

* Fixed kube-proxy to work correctly with iptables 1.6.2 and later. ([#60978](https://github.com/kubernetes/kubernetes/pull/60978), [@danwinship](https://github.com/danwinship))

* Makes the kube-dns addon optional so that users can deploy their own DNS solution. ([#57113](https://github.com/kubernetes/kubernetes/pull/57113), [@wwwtyro](https://github.com/wwwtyro))

    /** The key of the message: Upload File */
    public static final String LABELS_design_file = "{labels.design_file}";

    /** The key of the message: File Name (Optional) */
    public static final String LABELS_design_file_name = "{labels.design_file_name}";

    /** The key of the message: Upload */

* Skip multi-zone e2e tests unless provider is GCE, GKE or AWS ([#27871](https://github.com/kubernetes/kubernetes/pull/27871), [@lukaszo](https://github.com/lukaszo))
* Making DHCP_OPTION_SET_ID creation optional ([#27278](https://github.com/kubernetes/kubernetes/pull/27278), [@activars](https://github.com/activars))

## Changelog since v1.25.13

## Changes by Kind

### API Change

- Mark Job onPodConditions as optional in pod failure policy ([#120211](https://github.com/kubernetes/kubernetes/pull/120211), [@mimowo](https://github.com/mimowo)) [SIG API Machinery and Apps]

### Feature

  
  ### Apache CloudStack
  - Add support for Apache CloudStack
  
  ### AWS
  - Regenerate list of EC2 instances
  - Fix pricing endpoint in AWS China Region
  
  ### Azure
  - Add optional jitter on initial VMSS VM cache refresh, keep the refreshes spread over time
  - Serve from cache for the whole period of ongoing throttling
  - Fix unwanted VMSS VMs cache invalidation

- Mark Job onPodConditions as optional in pod failure policy ([#120210](https://github.com/kubernetes/kubernetes/pull/120210), [@mimowo](https://github.com/mimowo)) [SIG API Machinery and Apps]

### Feature

- Fix a concurrent map writes error in kubelet ([#93773](https://github.com/kubernetes/kubernetes/pull/93773), [@knight42](https://github.com/knight42)) [SIG Node]
- Fix a regression where kubeadm bails out with a fatal error when an optional version command line argument is supplied to the "kubeadm upgrade plan" command ([#94421](https://github.com/kubernetes/kubernetes/pull/94421), [@rosti](https://github.com/rosti)) [SIG Cluster Lifecycle]

## Changes by Kind

### API Change

- Make STS available replicas optional again, ([#109241](https://github.com/kubernetes/kubernetes/pull/109241), [@ravisantoshgudimetla](https://github.com/ravisantoshgudimetla)) [SIG API Machinery and Apps]
- Make STS available replicas optional again. ([#113122](https://github.com/kubernetes/kubernetes/pull/113122), [@ashrayjain](https://github.com/ashrayjain)) [SIG Apps]