<ul>
	<li>an
	    <a href="#Identifiers">identifier</a>
	</li>

	<li>an
	    <a href="#Integer_literals">integer</a>,
	    <a href="#Floating-point_literals">floating-point</a>,
	    <a href="#Imaginary_literals">imaginary</a>,
	    <a href="#Rune_literals">rune</a>, or
	    <a href="#String_literals">string</a> literal
	</li>

	<li>one of the <a href="#Keywords">keywords</a>
	    <code>break</code>,

    * <a href="https://fastapi.tiangolo.com/advanced/openapi-callbacks/" class="external-link" target="_blank">Advanced User Guide - OpenAPI Callbacks</a>.
    * <a href="https://fastapi.tiangolo.com/tutorial/bigger-applications/" class="external-link" target="_blank">Tutorial - Bigger Applications</a>.

    String CRAWLER_DOCUMENT_HTML_DIGEST_XPATH = "crawler.document.html.digest.xpath";

    /** The key of the configuration. e.g. //LINK[@rel='canonical'][1]/@href */
    String CRAWLER_DOCUMENT_HTML_CANONICAL_XPATH = "crawler.document.html.canonical.xpath";

    /** The key of the configuration. e.g. noscript,script,style,header,footer,aside,nav,a[rel=nofollow] */

                            "content": {
                                "application/json": {
                                    "schema": {
                                        "$ref": "#/components/schemas/HTTPValidationError"
                                    }
                                }
                            },
                        },

* StorageObjectInUseProtection is now GA ([ref](https://github.com/kubernetes/enhancements/issues/498)) and ([ref](https://github.com/kubernetes/enhancements/issues/499))

#### Graduated to Beta

* Supporting out-of-tree/external cloud providers is now considered beta ([ref](https://github.com/kubernetes/enhancements/issues/88))

* CustomResourceDefinitions: OpenAPI v3 validation schemas containing `$ref`references are no longer permitted. Before upgrading, ensure CRD definitions do not include those `$ref` fields. ([#58438](https://github.com/kubernetes/kubernetes/pull/58438), [@carlory](https://github.com/carlory))

### Federation

## Other notable changes

### API Machinery

- Remove `GetReference()` and `GetPartialReference()` function from `pkg/api/ref`, as the same function exists also in `staging/src/k8s.io/client-go/tools/ref` ([#80361](https://github.com/kubernetes/kubernetes/pull/80361), [@wojtek-t](https://github.com/wojtek-t))

- The `kubernetes.io/created-by` annotation is deprecated and will be removed in version 1.9.
  Use [ControllerRef](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/api-machinery/controller-ref.md) instead to determine which controller, if any, owns an object.

 - The `batch/v2alpha1.CronJob` is deprecated in favor of `batch/v1beta1`.

### Other notable changes

* CustomResourceDefinitions: OpenAPI v3 validation schemas containing `$ref`references are no longer permitted (valid references could not be constructed previously because property ids were not permitted either). Before upgrading, ensure CRD definitions do not include those `$ref` fields. ([#58438](https://github.com/kubernetes/kubernetes/pull/58438), [@carlory](https://github.com/carlory))