* A buffered audit backend can be used with other audit backends. ([#60076](https://github.com/kubernetes/kubernetes/pull/60076), [@crassirostris](https://github.com/crassirostris))

* Introduced `--http2-max-streams-per-connection` command line flag on api-servers and set default to 1000 for aggregated API servers. ([#60054](https://github.com/kubernetes/kubernetes/pull/60054), [@MikeSpreitzer](https://github.com/MikeSpreitzer))

check is enabled by default in all Kubernetes clients to fix persistently broken connections (https://github.com/kubernetes/client-go/issues/374). If needed, users can tune the feature via the HTTP2_READ_IDLE_TIMEOUT_SECONDS and HTTP2_PING_TIMEOUT_SECONDS environment variables. The feature is disabled if HTTP2_READ_IDLE_TIMEOUT_SECONDS is set to 0. ([#100376](https://github.com/kubernetes/kubernetes/pull/100376), [@liggitt](https://github.com/liggitt)) [SIG API Machinery, CLI, Cloud Provider, Cluster...

* Fix panic create/update CRD when mutating/validating webhook configured. ([#61404](https://github.com/kubernetes/kubernetes/pull/61404), [@hzxuzhonghu](https://github.com/hzxuzhonghu))
* Introduced `--http2-max-streams-per-connection` command line flag on api-servers and set default to 1000 for aggregated API servers. ([#60054](https://github.com/kubernetes/kubernetes/pull/60054), [@MikeSpreitzer](https://github.com/MikeSpreitzer))

* Fixed missing error checking that could cause kubelet to crash in a race condition. ([#60962](https://github.com/kubernetes/kubernetes/pull/60962), [@technicianted](https://github.com/technicianted))
* Introduced `--http2-max-streams-per-connection` command line flag on api-servers and set default to 1000 for aggregated API servers. ([#60054](https://github.com/kubernetes/kubernetes/pull/60054), [@MikeSpreitzer](https://github.com/MikeSpreitzer))

* GCE: Bump GLBC version to 1.1.0 - supporting multiple certificates and HTTP2 ([#62427](https://github.com/kubernetes/kubernetes/pull/62427), [@nicksardo](https://github.com/nicksardo))

- HTTP/2 connection health check is enabled by default in all Kubernetes clients. The feature should work out-of-the-box. If needed, users can tune the feature via the HTTP2_READ_IDLE_TIMEOUT_SECONDS and HTTP2_PING_TIMEOUT_SECONDS environment variables. The feature is disabled if HTTP2_READ_IDLE_TIMEOUT_SECONDS is set to 0. ([#95981](https://github.com/kubernetes/kubernetes/pull/95981), [@caesarxuchao](https://github.com/caesarxuchao)) [SIG API Machinery, CLI, Cloud Provider,...

- The kubelet no longer forcefully closes active connections on heartbeat failures, using the HTTP2 health check mechanism to detect broken connections. Users can force the previous behavior of the kubelet by setting the environment variable DISABLE_HTTP2. ([#108107](https://github.com/kubernetes/kubernetes/pull/108107), [@aojea](https://github.com/aojea))

* local-up-cluster.sh: add SERVICE_CLUSTER_IP_RANGE as option ([#32921](https://github.com/kubernetes/kubernetes/pull/32921), [@aanm](https://github.com/aanm))
* Default HTTP2 on, post fixes from [#29001](https://github.com/kubernetes/kubernetes/pull/29001) ([#32231](https://github.com/kubernetes/kubernetes/pull/32231), [@timothysc](https://github.com/timothysc))

- HTTP/2 connection health check is enabled by default in all Kubernetes clients. The feature should work out-of-the-box. If needed, users can tune the feature via the HTTP2_READ_IDLE_TIMEOUT_SECONDS and HTTP2_PING_TIMEOUT_SECONDS environment variables. The feature is disabled if HTTP2_READ_IDLE_TIMEOUT_SECONDS is set to 0. ([#96778](https://github.com/kubernetes/kubernetes/pull/96778), [@caesarxuchao](https://github.com/caesarxuchao)) [SIG API Machinery, CLI, Cloud Provider,...

  If users experiment problems with stale connections  using HTTP1.1, they can force the previous behavior of the kubelet by setting the environment variable DISABLE_HTTP2. ([#104844](https://github.com/kubernetes/kubernetes/pull/104844), [@aojea](https://github.com/aojea)) [SIG API Machinery, Auth and Node]