* fix nil dereference when doing a volume type check on persistent volumes ([#39529](https://github.com/kubernetes/kubernetes/pull/39529), [@sjenning](https://github.com/sjenning))
* Generate OpenAPI definition for inlined types ([#39466](https://github.com/kubernetes/kubernetes/pull/39466), [@mbohlool](https://github.com/mbohlool))

* Add Events for operation_executor to show status of mounts, failed/successful to show in describe events ([#27778](https://github.com/kubernetes/kubernetes/pull/27778), [@screeley44](https://github.com/screeley44))
* Alpha support for OpenAPI (aka. Swagger 2.0) specification served on /swagger.json (enabled by default)  ([#30233](https://github.com/kubernetes/kubernetes/pull/30233), [@mbohlool](https://github.com/mbohlool))