- Fixes bug where an incomplete OpenAPI V3 document can cause a nil-pointer crash.
  Ensures fallback to OpenAPI V2 endpoint for errors retrieving OpenAPI V3 document. ([#117918](https://github.com/kubernetes/kubernetes/pull/117918), [@seans3](https://github.com/seans3)) [SIG CLI]

nAPI feature is now beta and enabled by default. CustomResourceDefinitions with [structural schemas](https://github.com/kubernetes/enhancements/blob/master/keps/sig-api-machinery/20190425-structural-openapi.md) now publish schemas in the OpenAPI document served at `/openapi/v2`. CustomResourceDefinitions with non-structural schemas have a `NonStructuralSchema` condition added with details about what needs to be corrected in the validation schema. ([#77825](https://github.com/kubernetes/kubernetes/pull/77825),...

- Document that ServiceTopology feature is required to use `service.spec.topologyKeys`. ([#96528](https://github.com/kubernetes/kubernetes/pull/96528), [@andrewsykim](https://github.com/andrewsykim)) [SIG Apps]

- Kube-apiserver: Fixed OIDC discovery document publishing when external service account token signing was enabled. ([#131493](https://github.com/kubernetes/kubernetes/pull/131493), [@hoskeri](https://github.com/hoskeri)) [SIG API Machinery, Auth and Testing]

  KEPs or supporting documentation, please reference a specific commit and avoid
  linking directly to the master branch. This ensures that links reference a
  specific point in time, rather than a document that may change over time.
  
  See here for guidance on getting permanent links to files: https://help.github.com/en/articles/getting-permanent-links-to-files
  

- Fix race in alpha aggregated discovery handler
  Yes, discovery document will correctly return the resources for aggregated apiservers that do not implement aggregated disovery ([#115805](https://github.com/kubernetes/kubernetes/pull/115805), [@alexzielenski](https://github.com/alexzielenski)) [SIG API Machinery]

- Patched a leak of a discovery document that would occur when an Aggregated APIService changed its Spec.Service field and did not change it back. ([#123517](https://github.com/kubernetes/kubernetes/pull/123517), [@Jefftree](https://github.com/Jefftree))

canonicalized, so a single accented code point is distinct from the
same character constructed from combining an accent and a letter;
those are treated as two code points.  For simplicity, this document
will use the unqualified term <i>character</i> to refer to a Unicode code point
in the source text.
</p>
<p>
Each code point is distinct; for instance, uppercase and lowercase letters
are different characters.
</p>

  KEPs or supporting documentation, please reference a specific commit and avoid
  linking directly to the master branch. This ensures that links reference a
  specific point in time, rather than a document that may change over time.
  
  See here for guidance on getting permanent links to files: https://help.github.com/en/articles/getting-permanent-links-to-files
  

CSIMigrationvSphere feature gate is enabled, user should not upgrade to Kubernetes v1.22. vSphere CSI Driver does not support Kubernetes v1.22 yet because it uses v1beta1 CRD APIs. Support for v1.22 will be added at a later release. Check the following document for supported Kubernetes releases for a given [vSphere CSI Driver version](https://vsphere-csi-driver.sigs.k8s.io/compatiblity_matrix.html#compatibility-matrix-for-vsphere-csi-driver).

### Workloads that saturate nodes with pods may...