[@kawych](https://github.com/kawych))

* On cluster provision or upgrade, kubeadm now generates certs and secures all connections to the etcd static-pod with mTLS. This includes the etcd serving cert, the etcd peer cert, and the apiserver etcd client cert. Flags and hostMounts are added to the etcd and apiserver static-pods to load these certs. For connections to etcd, https is now used in favor of http. ([#57415](https://github.com/kubernetes/kubernetes/pull/57415), [@stealthybox](htt...

  be prematurely closed when deleting a pod with an iSCSI persistent volume attached and that prevented the use of newly created LUNs on targets with preestablished connections. ([#41196](https://github.com/kubernetes/kubernetes/pull/41196)), [@CristianPop](https://github.com/CristianPop))

# The URL of the search engine HTTP endpoint.
# For IPv6 environments, use brackets around the IPv6 address (e.g., http://[::1]:9201)
search_engine.http.url=http://localhost:9201
# Path to SSL certificate authorities for secure HTTP connections.
search_engine.http.ssl.certificate_authorities=
# Username for authenticating to the search engine.
search_engine.username=
# Password for authenticating to the search engine.
search_engine.password=

* Bump GCE debian image to container-v1-3-v20160604 ([#26851](https://github.com/kubernetes/kubernetes/pull/26851), [@zmerlynn](https://github.com/zmerlynn))
* Option to enable http2 on client connections. ([#25280](https://github.com/kubernetes/kubernetes/pull/25280), [@timothysc](https://github.com/timothysc))

- Fixes regression in logging spurious stack traces when proxied connections are closed by the backend ([#82588](https://github.com/kubernetes/kubernetes/pull/82588), [@liggitt](https://github.com/liggitt))

- Fixes a regression introduced in 1.29 where conntrack entries for UDP connections
  to deleted pods did not get cleaned up correctly, which could (among other things)

* After a kubelet rotates its client cert, it now closes its connections to the API server to force a handshake using the new cert. Previously, the kubelet could keep its existing connection open, even if the cert used for that connection was expired and rejected by the API server. ([#49899](https://github.com/kubernetes/kubernetes/pull/49899), [@ericchiang](https://github.com/ericchiang))

#### **Audit**

*   Fixed a bug so that `kube-apiserver` now waits for open connections to finish before exiting. This fix provides graceful shutdown and ensures that the audit backend no longer drops events on shutdown. ([#53695](https://github.com/kubernetes/kubernetes/pull/53695),[ @hzxuzhonghu](https://github.com/hzxuzhonghu))

by default). An API server fronted by an L7 load balancer that already mitigates these http/2 attacks may choose not to enable the kube-apiserver mitigation to avoid disrupting load balancer → kube-apiserver connections if http/2 requests from multiple clients share the same backend connection. An API server on a private network may choose not to enable the kube-apiserver mitigation to prevent performance regressions for unauthenticated clients. Authenticated requests rely on the fix in golang.org/x/net...

- When the `PreferSameTrafficDistribution` feature gate is enabled, a new `trafficDistribution` value `PreferSameNode` is available, which attempts to always route Service connections to an endpoint on the same node as the client. Additionally, `PreferSameZone` is introduced as an alias for `PreferClose`. ([#130844](https://github.com/kubernetes/kubernetes/pull/130844), [@danwinship](https://github.com/danwinship)) [SIG API Machinery,...