- client-go discovery clients constructed using `NewDiscoveryClientForConfig` or `NewDiscoveryClientForConfigOrDie` default to rate limits that cause normal discovery request patterns to take several seconds. This is fixed in https://issue.k8s.io/86168 and will be resolved in v1.17.1. As a workaround, the `Burst` value can be adjusted higher...

- Aggregated Discovery v2beta1 fixture is removed in `./api/discovery`. Please use v2 ([#127008](https://github.com/kubernetes/kubernetes/pull/127008), [@Jefftree](https://github.com/Jefftree)) [SIG API Machinery]

- Resolves a spurious "Unknown discovery response content-type" error in client-go discovery requests by tolerating extra content-type parameters in API responses ([#117571](https://github.com/kubernetes/kubernetes/pull/117571), [@seans3](https://github.com/seans3)) [SIG API Machinery]

* Support struct,array,slice types when sorting kubectl output ([#25022](https://github.com/kubernetes/kubernetes/pull/25022), [@zhouhaibing089](https://github.com/zhouhaibing089))
* federated api servers: Adding a discovery summarizer server ([#20358](https://github.com/kubernetes/kubernetes/pull/20358), [@nikhiljindal](https://github.com/nikhiljindal))

- Fixed a regression in the default `v1.27` configurations in `kube-apiserver`: fixed the `AggregatedDiscoveryEndpoint` feature (`beta` in `v1.27+`) to successfully fetch discovery information from aggregated API servers that do not check `Accept` headers when serving the `/apis` endpoint. ([#119870](https://github.com/kubernetes/kubernetes/pull/119870), [@Jefftree](https://github.com/Jefftree))

* Make discovery summarizer call servers in parallel ([#26705](https://github.com/kubernetes/kubernetes/pull/26705), [@nebril](https://github.com/nebril))

* Alpha JWS Discovery API for locating an apiserver securely ([#32203](https://github.com/kubernetes/kubernetes/pull/32203), [@dgoodwin](https://github.com/dgoodwin))

### Action Required

   * - 2 requests happen concurrently to a host that can be coalesced onto a single connection.
   * - Both request discover no existing connection. They both make a connection.
   * - The first request "wins the race".
   * - The second request discovers it "lost the race" and closes the connection it just opened.
   * - The second request uses the coalesced connection from request1.

- Kube-apiserver: Fixed OIDC discovery document publishing when external service account token signing was enabled. ([#131493](https://github.com/kubernetes/kubernetes/pull/131493), [@hoskeri](https://github.com/hoskeri)) [SIG API Machinery, Auth and Testing]

     */
    enum Nature {
        /**
         * Query only release repositories to discover versions.
         */
        RELEASE,
        /**
         * Query only snapshot repositories to discover versions.
         */
        SNAPSHOT,
        /**
         * Query both release and snapshot repositories to discover versions.
         * This is the default behavior.
         */
        RELEASE_OR_SNAPSHOT
    }