- Removed deprecated `gogo` protocol definitions from `k8s.io/kubelet/pkg/apis/pluginregistration` in favor of `google.golang.org/protobuf`. ([#132773](https://github.com/kubernetes/kubernetes/pull/132773), [@saschagrunert](https://github.com/saschagrunert))

- Kubectl: Add `--use-protocol-buffers` flag to kubectl top pods and nodes. ([#96655](https://github.com/kubernetes/kubernetes/pull/96655), [@serathius](https://github.com/serathius))

  This bug causes the conformance test "HostPort validates that there is no conflict between pods with same hostPort but different hostIP and protocol" to fail. ([#98838](https://github.com/kubernetes/kubernetes/pull/98838), [@aojea](https://github.com/aojea)) [SIG Network and Node]

### Bug or Regression

- Kube-apiserver: multiple comma-separated protocols in a single X-Stream-Protocol-Version header are now recognized, in addition to multiple headers, complying with RFC2616 ([#89857](https://github.com/kubernetes/kubernetes/pull/89857), [@tedyu](https://github.com/tedyu)) [SIG API Machinery]

* fix parse devicePath issue on Azure Disk ([#74499](https://github.com/kubernetes/kubernetes/pull/74499), [@andyzhangx](https://github.com/andyzhangx))
* fix mixed protocol issue for azure load balancer ([#74200](https://github.com/kubernetes/kubernetes/pull/74200), [@andyzhangx](https://github.com/andyzhangx))

- Fixes high CPU usage in kubectl drain ([#95260](https://github.com/kubernetes/kubernetes/pull/95260), [@amandahla](https://github.com/amandahla)) [SIG CLI]
- Kube-apiserver: multiple comma-separated protocols in a single X-Stream-Protocol-Version header are now recognized, in addition to multiple headers, complying with RFC2616 ([#89857](https://github.com/kubernetes/kubernetes/pull/89857), [@tedyu](https://github.com/tedyu)) [SIG API Machinery]

- AWS ELB health checks will now use HTTPS/SSL protocol for HTTPS/SSL backends. ([#70309](https://github.com/kubernetes/kubernetes/pull/70309), [@2rs2ts](https://github.com/2rs2ts))

### Azure

*   Load balancer reconciliation now considers NSG rules based not only on Name, but also on Protocol, SourcePortRange, DestinationPortRange, SourceAddressPrefix, DestinationAddressPrefix, Access, and Direction. This change makes it possible to update NSG rules under more conditions.  ([#55752](https://github.com/kubernetes/kubernetes/pull/55752),[...

* kubeadm: fixed nil pointer dereference caused by a bug in url parsing ([#74454](https://github.com/kubernetes/kubernetes/pull/74454), [@bart0sh](https://github.com/bart0sh))
* fix mixed protocol issue for azure load balancer ([#74200](https://github.com/kubernetes/kubernetes/pull/74200), [@andyzhangx](https://github.com/andyzhangx))

- Promoted to conformance a test that verified that `Services` only forward traffic on the port and protocol specified. ([#120069](https://github.com/kubernetes/kubernetes/pull/120069), [@aojea](https://github.com/aojea))