- kubectl: `--use-openapi-print-columns` has been deprecated in favor of `--server-print`, and will be removed in a future version. ([#65601](https://github.com/kubernetes/kubernetes/pull/65601), [@liggitt](https://github.com/liggitt))

In v1.9 SIG Network has implemented alpha support for IPv6, and alpha support for CoreDNS as a drop-in replacement for kube-dns. Additionally, SIG Network has begun the deprecation process for the extensions/v1beta1 NetworkPolicy API in favor of the networking.k8s.io/v1 equivalent.

### Node

- The `NetworkPolicyLegacy` test suite (deprecated in `v1.21`) has now officially been removed in favor of the new table driven e2e tests. ([#118915](https://github.com/kubernetes/kubernetes/pull/118915), [@astoycos](https://github.com/astoycos))

- Implemented the `scheduler_cache_size` metric.
Additionally, the `scheduler_scheduler_cache_size` metric is now deprecated in favor of `scheduler_cache_size`,
and will be removed in v1.34. ([#128810](https://github.com/kubernetes/kubernetes/pull/128810), [@googs1025](https://github.com/googs1025))

- Reminder: The labels "failure-domain.beta.kubernetes.io/zone" and "failure-domain.beta.kubernetes.io/region" are deprecated in favor of "topology.kubernetes.io/zone" and "topology.kubernetes.io/region" respectively.  All users of the "failure-domain.beta..." labels should switch to the "topology..." equivalents. ([#96033](https://github.com/kubernetes/kubernetes/pull/96033), [@...

* Add get/delete cluster, delete context to kubectl config ([#29821](https://github.co...

- Kube-apiserver: the `--master-count` flag and `--endpoint-reconciler-type=master-count` reconciler are deprecated in favor of the lease reconciler ([#108062](https://github.com/kubernetes/kubernetes/pull/108062), [@aojea](https://github.com/aojea))

#### GCE
* On GCI by default logrotate is disabled for application containers in favor of rotation mechanism provided by docker logging driver. ([#40634](https://github.com/kubernetes/kubernetes/pull/40634), [@crassirostris](https://github.com/crassirostris))

#### GKE

  - `node_memory_working_set_bytes`
  - `pod_cpu_usage_seconds_total`
  - `pod_memory_working_set_bytes`
  - `resource_scrape_error`
  
  Deprecated (renamed) `scrape_error` in favor of `resource_scrape_error` ([#116897](https://github.com/kubernetes/kubernetes/pull/116897), [@Richabanker](https://github.com/Richabanker)) [SIG Architecture, Instrumentation, Node and Testing]

- Built etcd image v3.5.14. ([#125235](https://github.com/kubernetes/kubernetes/pull/125235), [@humblec](https://github.com/humblec))
- Cleaned deprecated `context.StopCh` in favor of ctx. ([#125661](https://github.com/kubernetes/kubernetes/pull/125661), [@mjudeikis](https://github.com/mjudeikis))