*   Opaque integer resources (OIR), which were (deprecated in v1.8.), have been removed. ([#55103](https://github.com/kubernetes/kubernetes/pull/55103),[ @ConnorDoyle](https://github.com/ConnorDoyle))

### **Storage**

    * With WatchBookmark feature, clients are able to request watch events with BOOKMARK type. Clients should not assume bookmarks are returned at any specific interval, nor may they assume the server will send any BOOKMARK event during a session.

- Promote WatchBookmark feature to beta and enable it by default.
  With WatchBookmark feature, clients are able to request watch events with BOOKMARK type. Clients should not assume bookmarks are returned at any specific interval, nor may they assume the server will send any BOOKMARK event during a session. ([#79786](https://github.com/kubernetes/kubernetes/pull/79786), [@wojtek-t](https://github.com/wojtek-t))

because it frontends equivalent mirrors in other clouds.  Please point your clusters to the new registry going forward. \n\nAdmission/Policy integrations that have an allowlist of registries need to include `registry.k8s.io` alongside `k8s.gcr.io`.\nAir-gapped environments and image garbage-collection configurations will need to update to pre-pull and preserve required images under `registry.k8s.io` as well as `k8s.gcr.io`. ([#109938](https://github.com/kubernetes/kubernetes/pull/109938), [@dims]...

  * Note that because any taints you might have created with Kubernetes 1.5 can only affect the scheduling of new pods (the `NoExecute` taint effect is introduced in 1.6), neither the master upgrade nor your running `kubectl taint` to re-create the taints will affect pods that are already running.

- CEL can now correctly handle a CRD `openAPIV3Schema` that has neither `Properties` nor `AdditionalProperties`. ([#121459](https://github.com/kubernetes/kubernetes/pull/121459), [@jiahuif](https://github.com/jiahuif))