- The `flowcontrol.apiserver.k8s.io/v1beta3` `FlowSchema` and `PriorityLevelConfiguration` APIs has been promoted to `flowcontrol.apiserver.k8s.io/v1`, with the following changes:

- Implemented logging for failed transactions and the full table in `kube-proxy` with 
`nftables` when using log level 4 or higher. Logging is rate-limited to one entry every 24 hours 
to avoid performance issues. ([#128886](https://github.com/kubernetes/kubernetes/pull/128886), [@npinaeva](https://github.com/npinaeva))
- Implemented the `scheduler_cache_size` metric.

  - Please adapt your workloads to tolerate the same future taint preemptively.
    
- Kubeadm: improve the validation of serviceSubnet and podSubnet.
  ServiceSubnet has to be limited in size, due to implementation details, and the mask can not allocate more than 20 bits.

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- Dynamic Resource Allocation (DRA): Added a feature so the number of ResourceClaim objects can be limited per namespace and by the number of devices requested through a specific class via the v1.ResourceQuota mechanism. ([#120611](https://github.com/kubernetes/kubernetes/pull/120611), [@pohly](https://github.com/pohly)) [SIG API Machinery, Apps, Auth,...

### Ephemeral Containers Graduate to Stable

  worked with the EndpointSliceController.) ([#91399](https://github.com/kubernetes/kubernetes/pull/91399), [@danwinship](https://github.com/danwinship)) [SIG Apps and Network]
- Fixes a bug evicting pods after a taint with a limited tolerationSeconds toleration is removed from a node ([#93722](https://github.com/kubernetes/kubernetes/pull/93722), [@liggitt](https://github.com/liggitt)) [SIG Apps and Node]

* Fixes a flaw (CVE-2019-11253) in json/yaml decoding where large or malformed documents could consume excessive server resources. Request bodies for normal API requests (create/delete/update/patch operations of regular resources) are now limited to 3MB. ([#83261](https://github.com/kubernetes/kubernetes/pull/83261), [@liggitt](https://github.com/liggitt))

* The `NodeRestriction` admission plugin limits the `Node` and `Pod` objects a kubelet can modify. In order to be limited by this admission plugin, kubelets must use credentials in the `system:nodes` group, with a username in the form `system:node:<nodeName>`. Such kubelets will only be allowed to modify their own `Node` API object, and only modify `Pod` API objects...

* The `NodeRestriction` admission plugin limits the `Node` and `Pod` objects a kubelet can modify. In order to be limited by this admission plugin, kubelets must use credentials in the `system:nodes` group, with a username in the form `system:node:<nodeName>`. Such kubelets will only be allowed to modify their own `Node` API object, and only modify `Pod` API objects...