### Default Container Annotation

Pod with multiple containers can use `kubectl.kubernetes.io/default-container` annotation to have a container preselected for kubectl commands. More can be read in [KEP-2227](https://github.com/kubernetes/enhancements/blob/master/keps/sig-cli/2227-kubectl-default-container/README.md).

### Immutable Secrets and ConfigMaps

### API Change

- #### Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:
  
  <!--
  This section can be blank if this pull request does not require a release note.
  
  When adding links which point to resources within git repositories, like
  KEPs or supporting documentation, please reference a specific commit and avoid

  Please see [the KEP](https://github.com/kubernetes/enhancements/tree/master/keps/sig-storage/1710-selinux-relabeling#story-3-cluster-upgrade) how we expect to warn users before any SELinux behavior changes and how they can opt-out before. Note that this field and feature gate is useful only with clusters...

  `successPolicy` regardless of the `featureGate` being enabled. ([#125429](https://github.com/kubernetes/kubernetes/pull/125429), [@tenzen-y](https://github.com/tenzen-y))
- ```
  
  #### Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.: ([#125272](https://github.com/kubernetes/kubernetes/pull/125272), [@mauri870](https://github.com/mauri870))

- Added a condition `NonStructuralSchema` to `CustomResourceDefinition` listing Structural Schema violations as defined in the [KEP](https://github.com/kubernetes/enhancements/blob/master/keps/sig-api-machinery/20190425-structural-openapi.md). CRD authors should update their validation schemas to be structural in order to participate in future CRD features. ([#77207](https://github.com/kubernetes/kubernetes/pull/77207),...

- Graduated _forensic container checkpointing_ [KEP #2008](https://kep.k8s.io/2008) from Alpha to Beta. ([#123215](https://github.com/kubernetes/kubernetes/pull/123215), [@adrianreber](https://github.com/adrianreber)) [SIG Node and Testing]

deprecated.\n//\n// Originally added during our alphas and maintained during betas, this mixin was\n// designed to prevent `:hover` stickiness on iOS-an issue where hover styles\n// would persist after initial touch.\n//\n// For backward compatibility, we've kept these mixins and updated them to\n// always return their regular pseudo-classes instead of a shimmed media query.\n//\n// Issue: https://github.com/twbs/bootstrap/issues/25195\n\n@mixin hover() {\n  &:hover { @content; }\n}\n\n@mixin hover-focus()...

- [API Server Network Proxy](https://github.com/kubernetes/enhancements/blob/master/keps/sig-api-machinery/1281-network-proxy/README.md) going alpha in 1.16.
- [Extensions](https://github.com/kubernetes/enhancements/blob/master/keps/sig-cloud-provider/991-cloud-controller-migration/README.md) for Cloud Controller Manager Migration.

### Feature

- #### Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:
  
  <!--
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  When adding links which point to resources within git repositories, like
  KEPs or supporting documentation, please reference a specific commit and avoid

### Promoted Local Ephemeral Storage Capacity Isolation to Stable