`admissionregistration.k8s.io/v1beta1.ValidatingWebhookConfiguration` and `admissionregistration.k8s.io/v1beta1.MutatingWebhookConfiguration` so that webhooks can explicitly register as having dry-run support. If a dry-run request is made on a resource that triggers a non dry-run supporting webhook, the request will be completely rejected, with "400: Bad Request". Additionally, a new field is being added to the `admission.k8s.io/v1beta1.AdmissionReview` API object, exposing to webhooks whether or not the request...

  a) transformation error e.g. decryption failure, or b) the object failed to decode. Normal deletion flow is
  attempted first, and if it fails with a corrupt resource error then it triggers unsafe delete.
  In addition, when this feature is enabled, the 'details' field of 'Status' from the LIST response
  includes information that identifies the corrupt object(s).

    * List of available GPUs - [https://cloud.google.com/compute/docs/gpus/#introduction](https://cloud.google.com/compute/docs/gpus/#introduction)

  * Disk Pressure triggers the deletion of terminated containers on the node. ([#45896](https://github.com/kubernetes/kubernetes/pull/45896), [@dashpole](https://github.com/dashpole))

- Improved reboot event reporting. The kubelet will only emit one reboot Event when a server-level reboot 
is detected, even if the kubelet cannot write its status to the associated Node (which triggers a retry). ([#129151](https://github.com/kubernetes/kubernetes/pull/129151), [@rphillips](https://github.com/rphillips)) [SIG Node]

- Changed handling of CustomResourceDefinitions with unrecognized formats. Writing a schema with an unrecognized formats now triggers a warning (the write is still accepted). ([#133136](https://github.com/kubernetes/kubernetes/pull/133136), [@yongruilin](https://github.com/yongruilin)) [SIG API Machinery]

* Respect PDBs during node upgrades and add test coverage to the ServiceTest upgrade test. ([#45748](https://github.com/kubernetes/kubernetes/pull/45748), [@mml](https://github.com/mml))
* Disk Pressure triggers the deletion of terminated containers on the node. ([#45896](https://github.com/kubernetes/kubernetes/pull/45896), [@dashpole](https://github.com/dashpole))

In an expression switch,
the switch expression is evaluated and
the case expressions, which need not be constants,
are evaluated left-to-right and top-to-bottom; the first one that equals the
switch expression
triggers execution of the statements of the associated case;
the other cases are skipped.
If no case matches and there is a "default" case,
its statements are executed.

     other widely used forms
   * Where there's a hierarchy in the types, list it via a parent
   * Highly specific magic matches get a high priority
   * General magic matches which could trigger a false-positive need
     a low one
   * The priority for containers normally need to be higher than for
     the things they contain, so they don't accidently get detected
     as what's in them

- Ensure Job status updates are batched by 1s. This fixes an unlikely scenario when a sequence of immediately 
  completing pods could trigger a sequence of non-batched Job status updates. ([#118470](https://github.com/kubernetes/kubernetes/pull/118470), [@mimowo](https://github.com/mimowo)) [SIG Apps]

- Improved scheduling latency when there are many gated pods and events that trigger requeueing from the unschedulable pool. ([#124618](https://github.com/kubernetes/kubernetes/pull/124618), [@gabesaba](https://github.com/gabesaba)) [SIG Scheduling and Testing]