- Published OpenAPI for the StatefulSet schema is corrected to indicate the `.spec.serviceName` is optional. ([#130233](https://github.com/kubernetes/kubernetes/pull/130233), [@soltysh](https://github.com/soltysh)) [SIG API Machinery, Apps and Testing]

### Other notable changes

- Fix performance issue when creating large objects using SSA with fully unspecified schemas (preserveUnknownFields). ([#111914](https://github.com/kubernetes/kubernetes/pull/111914), [@aojea](https://github.com/aojea)) [SIG API Machinery, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Storage and Testing]

'{"apiVersion":"v1","kind":"Namespace","metadata":{"name":"kube-system"}}' "[http://127.0.0.1:8080/api/v1/namespaces](http://127.0.0.1:8080/api/v1/namespaces)"</code>
  * The version of InfluxDB is bumped from 0.8 to 0.9 which means storage schema
change. More details [here](https://docs.influxdata.com/influxdb/v0.9/administration/upgrading/).
  * We have renamed “minions” to “nodes”.  If you were specifying NUM\_MINIONS or

- Introduced OpenAPI format support for `k8s-short-name` and `k8s-long-name` in CustomResourceDefinition schemas. ([#132504](https://github.com/kubernetes/kubernetes/pull/132504), [@jpbetz](https://github.com/jpbetz)) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Network, Node, Scheduling and Storage]

- Fixed performance issue when creating large objects using SSA with fully unspecified schemas ( preserveUnknownFields ). ([#111557](https://github.com/kubernetes/kubernetes/pull/111557), [@alexzielenski](https://github.com/alexzielenski))

## Changelog since v1.20.11

## Changes by Kind

### API Change

- Kube-apiserver: Fixes handling of CRD schemas containing literal null values in enums (#104990, @liggitt) [SIG API Machinery, Apps and Network]

### Bug or Regression

* fix GetVolumeLimits log flushing issue ([#69558](https://github.com/kubernetes/kubernetes/pull/69558), [@andyzhangx](https://github.com/andyzhangx))
* kube-apiserver: fixes `procMount` field incorrectly being marked as required in openapi schema ([#69744](https://github.com/kubernetes/kubernetes/pull/69744), [@jessfraz](https://github.com/jessfraz))

- Kube-apiserver: fixes a potential crash serving CustomResourceDefinitions that combine an invalid schema and CEL validation rules. ([#126167](https://github.com/kubernetes/kubernetes/pull/126167), [@cici37](https://github.com/cici37)) [SIG API Machinery and Testing]

		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrMalformedXML: {
		Code:           "MalformedXML",
		Description:    "The XML you provided was not well-formed or did not validate against our published schema.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrMissingContentLength: {
		Code:           "MissingContentLength",
		Description:    "You must provide the Content-Length HTTP header.",