/** The key of the configuration. e.g. false */
    String API_JSONP_ENABLED = "api.jsonp.enabled";

    /** The key of the configuration. e.g. status,timed_out */
    String API_PING_search_engine_FIELDS = "api.ping.search_engine.fields";

    /** The key of the configuration. e.g.  */
    String VIRTUAL_HOST_HEADERS = "virtual.host.headers";

    /** The key of the configuration. e.g.  */

* Fixes API compatibility issue with empty lists incorrectly returning a null `items` field instead of an empty array. ([#39834](https://github.com/kubernetes/kubernetes/pull/39834), [@liggitt](https://github.com/liggitt))
* Re-add /healthz/ping handler in genericapiserver ([#38603](https://github.com/kubernetes/kubernetes/pull/38603), [@sttts](https://github.com/sttts))