// +optional
  optional ObjectFieldSelector fieldRef = 1;

  // Selects a resource of the container: only resources limits and requests
  // (limits.cpu, limits.memory, limits.ephemeral-storage, requests.cpu, requests.memory and requests.ephemeral-storage) are currently supported.
  // +optional
  optional ResourceFieldSelector resourceFieldRef = 2;

- Critical pods can now be created in namespaces other than kube-system. To limit critical pods to the kube-system namespace, cluster admins should create an admission configuration file limiting critical pods by default, and a matching quota object in the `kube-system` namespace permitting critical pods in that namespace. See https://kubernetes.io/docs/concepts/policy/resource-quotas/#limit-priority-class-consumption-by-default for details. ([#76310](https://github.com/kubernetes...

- Add possibility to configure controller manager to use IPv6 dual stack:
  use `--cluster-cidr="<cidr1>,<cidr2>"`.
  Notes:
  1. Only the first two CIDRs are used (soft limits for Alpha, might be lifted later on).
  2. Only the "RangeAllocator" (default) is allowed as a value for `--cidr-allocator-type`. Cloud allocators are not compatible with IPv6 dual stack

- Apiserver `/healthz/etcd` endpoint rate limits the number of forwarded health check requests to the etcd backends, answering with the last known state if the rate limit is exceeded. The rate limit is based on 1/2 of the timeout configured, with no burst allowed. ([#112046](https://github.com/kubernetes/kubernetes/pull/112046), [@aojea](https://github.com/aojea))

    * Custom apiservers built with the latest apiserver library will have the 100MB limit on the body of resource requests as well. The limit can be altered via ServerRunOptions.MaxRequestBodyBytes.
    * The body size limit does not apply to subresources like pods/proxy that proxy request content to another server.

- Generic ephemeral volumes are beta. ([#99643](https://github.com/kubernetes/kubernetes/pull/99643), [@pohly](https://github.com/pohly)) [SIG API Machinery, Apps, Auth, CLI, Node, Storage and Testing]
- Hugepages request values are limited to integer multiples of the page size. ([#98515](https://github.com/kubernetes/kubernetes/pull/98515), [@lala123912](https://github.com/lala123912)) [SIG Apps]

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

    * Custom apiservers built with the latest apiserver library will have the 100MB limit on the body of resource requests as well. The limit can be altered via ServerRunOptions.MaxRequestBodyBytes.
    * The body size limit does not apply to subresources like pods/proxy that proxy request content to another server.

### PID Limits graduates to General Availability

PID Limits features are now generally available on both `SupportNodePidsLimit` (node-to-pod PID isolation) and `SupportPodPidsLimit` (ability to limit PIDs per pod), after being enabled-by-default in beta stage for a year.

### API Priority and Fairness graduates to Beta

- Azure network and VM clients now suppress requests on throttling ([#87122](https://github.com/kubernetes/kubernetes/pull/87122), [@feiskyer](https://github.com/feiskyer))...