### Features

* ✨ Add support for OpenAPI 3.1.0. PR [#9770](https://github.com/tiangolo/fastapi/pull/9770) by [@tiangolo](https://github.com/tiangolo).
    * New support for documenting **webhooks**, read the new docs here: <a href="https://fastapi.tiangolo.com/advanced/openapi-webhooks/" class="external-link" target="_blank">Advanced User Guide: OpenAPI Webhooks</a>.
    * Upgrade OpenAPI 3.1.0, this uses JSON Schema 2020-12.

Defaulting will be available as alpha in Kubernetes 1.15 and requires structural schemas.

#### CustomResourceDefinition OpenAPI Publishing

- github.com/go-openapi/analysis: [v0.19.5](https://github.com/go-openapi/analysis/tree/v0.19.5)
- github.com/go-openapi/errors: [v0.19.2](https://github.com/go-openapi/errors/tree/v0.19.2)
- github.com/go-openapi/loads: [v0.19.4](https://github.com/go-openapi/loads/tree/v0.19.4)
- github.com/go-openapi/runtime: [v0.19.4](https://github.com/go-openapi/runtime/tree/v0.19.4)

- github.com/go-openapi/loads: [v0.17.2 → v0.19.2](https://github.com/go-openapi/loads/compare/v0.17.2...v0.19.2)
- github.com/go-openapi/runtime: [v0.17.2 → v0.19.0](https://github.com/go-openapi/runtime/compare/v0.17.2...v0.19.0)
- github.com/go-openapi/spec: [v0.17.2 → v0.19.2](https://github.com/go-openapi/spec/compare/v0.17.2...v0.19.2)

- github.com/go-openapi/jsonpointer: [v0.19.5 → v0.19.6](https://github.com/go-openapi/jsonpointer/compare/v0.19.5...v0.19.6)
- github.com/go-openapi/jsonreference: [v0.20.0 → v0.20.1](https://github.com/go-openapi/jsonreference/compare/v0.20.0...v0.20.1)
- github.com/go-openapi/swag: [v0.19.14 → v0.22.3](https://github.com/go-openapi/swag/compare/v0.19.14...v0.22.3)

- github.com/ghodss/yaml: c7ce166 → v1.0.0
- github.com/go-openapi/analysis: v0.19.2 → v0.19.5
- github.com/go-openapi/jsonpointer: v0.19.2 → v0.19.3
- github.com/go-openapi/jsonreference: v0.19.2 → v0.19.3
- github.com/go-openapi/loads: v0.19.2 → v0.19.4
- github.com/go-openapi/runtime: v0.19.0 → v0.19.4
- github.com/go-openapi/spec: v0.19.2 → v0.19.3
- github.com/go-openapi/strfmt: v0.19.0 → v0.19.3

- NONE ([#124327](https://github.com/kubernetes/kubernetes/pull/124327), [@ritazh](https://github.com/ritazh)) [SIG Auth]
- OpenAPI V2 will no longer publish aggregated apiserver OpenAPI for group-versions not matching the APIService specified group version ([#123624](https://github.com/kubernetes/kubernetes/pull/123624), [@Jefftree](https://github.com/Jefftree)) [SIG API Machinery and Testing]

  - The OpenAPI definitions with the prefix "io.k8s.kubernetes.pkg" (deprecated since 1.9) have been removed. ([#7459...

- Removed deprecated command `kubectl stop`.

- Kubectl can now use http caching for the OpenAPI schema. The cache
  directory can be configured by passing the `--cache-dir` command line flag to kubectl.
  If set to an empty string, caching is disabled.

- Kubectl now performs validation against OpenAPI schema instead of Swagger 1.2. If
  OpenAPI is not available on the server, it falls back to the old Swagger 1.2.

- Revised `OpenAPI v2` fetching for CustomResourceDefinitions. CRDs are now aggregated lazily,
  which improves resource usage during installation of many CRDs. As a result, the first request
  to fetch the OpenAPI may be slower. ([#118808](https://github.com/kubernetes/kubernetes/pull/118808), [@Jefftree](https://github.com/Jefftree))