- Added `--output plaintext-openapiv2` argument to kubectl explain to use old openapiv2 `explain` implementation. ([#115480](https://github.com/kubernetes/kubernetes/pull/115480), [@alexzielenski](https://github.com/alexzielenski))

- Fixed bug where explain was not properly respecting jsonpaths. ([#115694](https://github.com/kubernetes/kubernetes/pull/115694), [@mpuckett159](https://github.com/mpuckett159))

* `crds` has been added as a shortname for CustomResourceDefinition, as in `kubectl get crds` ([#59061](https://github.com/kubernetes/kubernetes/pull/59061), [@nikhita](https://github.com/nikhita))

* Fix kubectl explain for resources not existing in default version of API group, such as  `batch/v1, Kind=CronJob`. ([#58753](https://github.com/kubernetes/kubernetes/pull/58753), [@soltysh](https://github.com/soltysh))

*   `kubectl explain` now explains `apiservices` and `customresourcedefinition`. (Updated to use OpenAPI instead of Swagger 1.2.) ([#53228](https://github.com/kubernetes/kubernetes/pull/53228),[ @apelisse](https://github.com/apelisse))

### SIG vSphere

* Added a mechanism in vSphere Cloud Provider to get credentials from Kubernetes secrets, rather than the plain text `vsphere.conf` file.([#63902](https://github.com/kubernetes/kubernetes/pull/63902), [@abrarshivani](https://github.com/abrarshivani))

- Modified command line errors (for example, `kubectl list` -> `unknown command`) that were printed as log message with escaped line breaks instead of a multi-line plain text, making the error hard to read. ([#107044](https://github.com/kubernetes/kubernetes/pull/107044), [@pohly](https://github.com/pohly))

#### CustomResourceDefinition OpenAPI Publishing

OpenAPI specs for native types have long been served at /openapi/v2, and they are consumed by a number of components, notably kubectl client-side validation, kubectl explain and OpenAPI based client generators.

With Kubernetes 1.15 as beta, OpenAPI schemas are also published for CRDs, as long as their schemas are structural.

- Adds alpha --output plaintext protected by environment variable `KUBECTL_EXPLAIN_OPENAPIV3` ([#113146](https://github.com/kubernetes/kubernetes/pull/113146), [@alexzielenski](https://github.com/alexzielenski)) [SIG CLI]

So, a request with a content type of `text/plain` containing JSON data would be accepted and the JSON data would be extracted.

  "Local" routes traffic to node-local endpoints only, and traffic is dropped if no node-local endpoints are ready.
  The default value is "Cluster". ([#96600](https://github.com/kubernetes/kubernetes/pull/96600), [@maplain](https://github.com/maplain)) [SIG API Machinery, Apps and Network]