* Processing a response after being generated by *path operation functions* but before returning it. E.g. adding custom headers, logging, adding extra metadata.
    * New docs section: [Custom Request and APIRoute class](https://fastapi.tiangolo.com/advanced/custom-request-and-route/).

### ConfigMap
* Volumes and environment variables populated from ConfigMap and Secret objects can now tolerate the named source object or specific keys being missing, by adding `optional: true` to the volume or environment variable source specifications. ([#39981](https://github.com/kubernetes/kubernetes/pull/39981), [@fraenkel](https://github.com/fraenkel))

    - kubeadm: implemented CRI detection for Windows worker nodes ([#78053](https://github.com/kubernetes/kubernetes/pull/78053), [@ksubrmnn](https://github.com/ksubrmnn))
- Worked toward support for Windows Server version 1903, including adding Windows support for preserving the destination IP as the VIP when loadbalancing with DSR. ([#74825](https://github.com/kubernetes/kubernetes/pull/74825), [@ksubrmnn](https://github.com/ksubrmnn))

- [`KT-56755`](https://youtrack.jetbrains.com/issue/KT-56755) K2: Investigate failures related to line numbers with LT compilation enabled
- [`KT-56139`](https://youtrack.jetbrains.com/issue/KT-56139) K2: consider adding source element for implicit receivers
- [`KT-57489`](https://youtrack.jetbrains.com/issue/KT-57489) K2: Incorrectly generated line numbers in companion object access inside class

* Fix a scalability issue where high rates of event writes degraded etcd performance. ([#64539](https://github.com/kubernetes/kubernetes/pull/64539), [@ccding](https://github.com/ccding))
* "kubectl delete" no longer waits for dependent objects to be deleted when removing parent resources ([#65908](https://github.com/kubernetes/kubernetes/pull/65908), [@juanvallejo](https://github.com/juanvallejo))

* Improve Azure instance metadata handling by adding caches. ([#70353](https://github.com/kubernetes/kubernetes/pull/70353), [@feiskyer](https://github.com/feiskyer))
* adding cn-northwest-1 for AWS China Ningxia region ([#70155](https://github.com/kubernetes/kubernetes/pull/70155), [@pahud](https://github.com/pahud))

  
  Portworx CSI driver is required to enable migration.
  This PR adds support of the `CSIMigrationPortworx` feature gate, which can be enabled by:
  
  1. Adding the feature flag to the kube-controller-manager `--feature-gates=CSIMigrationPortworx=true` 
  2. Adding the feature flag to the kubelet config:
  
  featureGates:

### Container Images

All container images are available as manifest lists and support the described
architectures. It is also possible to pull a specific architecture directly by
adding the "-$ARCH" suffix  to the container image name.

name | architectures
---- | -------------

### Container Images

All container images are available as manifest lists and support the described
architectures. It is also possible to pull a specific architecture directly by
adding the "-$ARCH" suffix  to the container image name.

name | architectures
---- | -------------

### Container Images

All container images are available as manifest lists and support the described
architectures. It is also possible to pull a specific architecture directly by
adding the "-$ARCH" suffix  to the container image name.

name | architectures
---- | -------------