* FIX: The OpenStack cloud providers DeleteRoute method fails to delete routes when it can’t find the corresponding instance in OpenStack. ([#62729](https://github.com/kubernetes/kubernetes/pull/62729), [@databus23](https://github.com/databus23))

- Added CEL runtime cost calculation into CustomerResource validation. CustomerResource validation will fail if runtime cost exceeds the budget. ([#108482](https://github.com/kubernetes/kubernetes/pull/108482), [@cici37](https://github.com/cici37))
- Added a new metric `webhook_fail_open_count` to monitor webhooks that fail to open. ([#107171](https://github.com/kubernetes/kubernetes/pull/107171), [@ltagliamonte-dd](https://github.com/ltagliamonte-dd))

- Panics while calling validating admission webhook are caught and honor the fail open or fail closed setting. ([#108746](https://github.com/kubernetes/kubernetes/pull/108746), [@deads2k](https://github.com/deads2k)) [SIG API Machinery]

- `framework.ExpectNoError` no longer logs the error and instead relies on using the new `log.Fail` as gomega fail handler. ([#80253](https://github.com/kubernetes/kubernetes/pull/80253), [@pohly](https://github.com/pohly))

### Windows

- Fixed StatefulSet to show the valid status even if the new replica creation fails. ([#112084](https://github.com/kubernetes/kubernetes/pull/112084), [@gjkim42](https://github.com/gjkim42)) [SIG Apps and Testing]
- Kube-apiserver: bugfix DeleteCollection API fails if request body is non-empty ([#113967](https://github.com/kubernetes/kubernetes/pull/113967), [@sxllwx](https://github.com/sxllwx)) [SIG API Machinery]

- Fix a panic in `kubectl debug` when a pod has multiple init or ephemeral containers. ([#94580](https://github.com/kubernetes/kubernetes/pull/94580), [@kiyoshim55](https://github.com/kiyoshim55))
- 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]

    - [Workloads that saturate nodes with pods may see pods that fail due to node admission](#workloads-that-saturate-nodes-with-pods-may-see-pods-that-fail-due-to-node-admission)
    - [Etcd v3.5.[0-2] data corruption](#etcd-v350-2-data-corruption)
  - [Urgent Upgrade Notes](#urgent-upgrade-notes)

- Added `ResourceVersion` as a precondition for delete in order to ensure a delete fails if an unobserved change happens to an object. ([#74040](https://github.com/kubernetes/kubernetes/pull/74040), [@ajatprabha](https://github.com/ajatprabha))

* In case kubeadm can't access the current Kubernetes version remotely and fails to parse the git-based version it falls back to a static predefined value of k8s.io/kubernetes/cmd/kubeadm/app/constants.CurrentKubernetesVersion. ([#72454](https://github.com/kubernetes/kubernetes/pull/72454), [@rojkov](https://github.com/rojkov))

* Remove support for trusty in GCE kube-up. ([#41670](https://github.com/kubernetes/kubernetes/pull/41670), [@mikedanese](https://github.com/mikedanese))
* Don't fail if the grep fails to match any resources ([#41933](https://github.com/kubernetes/kubernetes/pull/41933), [@ixdy](https://github.com/ixdy))