* The AWS cloudprovider will cache results from DescribeInstances() if the set of nodes hasn't changed ([#26900](https://github.com/kubernetes/kubernetes/pull/26900), [@therc](https://github.com/therc))
* GCE provider: Log full contents of long operations ([#26962](https://github.com/kubernetes/kubernetes/pull/26962), [@zmerlynn](https://github.com/zmerlynn))

- Kubeadm: avoid panicing if the user has malformed the kubeconfig in the cluster-info config map to not include a valid current context. Include proper validation at the appropriate locations and throw errors instead. ([#134724](https://github.com/kubernetes/kubernetes/pull/134724), [@neolit123](https://github.com/neolit123)) [SIG Cluster Lifecycle]

### API Change

* Add get/delete cluster, delete context to kubectl config ([#29821](https://github.com/kubernetes/kubernetes/pull/29821), [@alexbrand](https://github.com/alexbrand))

  termination message log file. The termination message file is now properly
  readable for end users and has a maximum size (4k bytes) to prevent abuse.
  Each pod may have up to 12k bytes of termination messages before the contents
  of each will be truncated.
* Do not delete pod objects until all its compute resource footprint has been
  reclaimed.
  - This feature prevents the node and scheduler from oversubscribing resources

   * loading, or expired. Unlike {@link Segment#getLiveValue} this method does not attempt to clean
   * up stale entries. As such it should only be called outside a segment context, such as during
   * iteration.
   */
  @Nullable V getLiveValue(ReferenceEntry<K, V> entry, long now) {
    if (entry.getKey() == null) {
      return null;
    }

Certificate management has become more robust in 1.15, with kubeadm now seamlessly rotating all your certificates (on upgrades) before they expire. Check the [kubeadm documentation](https://github.com/kubernetes/website/blob/dev-1.15/content/en/docs/reference/setup-tools/kubeadm/kubeadm-alpha.md) for information on how to manage your certificates.

The kubeadm configuration file API is moving from v1beta1 to v1beta2 in 1.15.

    /** The key of the message: Config Parameter */
    public static final String LABELS_CONFIG_PARAMETER = "{labels.configParameter}";

    /** The key of the message: Content */
    public static final String LABELS_CONTENT = "{labels.content}";

    /** The key of the message: CSV Encoding */
    public static final String LABELS_CSV_FILE_ENCODING = "{labels.csvFileEncoding}";

   * loading, or expired. Unlike {@link Segment#getLiveValue} this method does not attempt to clean
   * up stale entries. As such it should only be called outside a segment context, such as during
   * iteration.
   */
  @Nullable V getLiveValue(ReferenceEntry<K, V> entry, long now) {
    if (entry.getKey() == null) {
      return null;
    }

   ([#123461](https://github.com/kubernetes/kubernetes/pull/123461), [@carlory](https://github.com/carlory))
- Made decoding etcd's response respect the timeout context.
   ([#121815](https://github.com/kubernetes/kubernetes/pull/121815), [@HirazawaUi](https://github.com/HirazawaUi))