- The `/swaggerapi/*` schema docs, deprecated since 1.7, have been removed in favor of the /openapi/v2 schema docs. ([#72924](https://github.com/kubernetes/kubernetes/pull/72924), [@liggitt](https://github.com/liggitt))

* Deprecate OpenAPI spec for GroupVersion endpoints in favor of single spec /swagger.json ([#35388](https://github.com/kubernetes/kubernetes/pull/35388), [@mbohlool](https://github.com/mbohlool))

   * uncommon to specify {@code concurrencyLevel(1)} in order to achieve more deterministic eviction
   * behavior.
   *
   * <p>Note that future implementations may abandon segment locking in favor of more advanced
   * concurrency controls.
   *
   * @return this {@code CacheBuilder} instance (for chaining)
   * @throws IllegalArgumentException if {@code concurrencyLevel} is nonpositive

- github.com/naoina/toml: [v0.1.1](https://github.com/naoina/toml/tree/v0.1.1)
- github.com/robfig/cron: [v1.1.0](https://github.com/robfig/cron/tree/v1.1.0)
- github.com/satori/go.uuid: [v1.2.0](https://github.com/satori/go.uuid/tree/v1.2.0)
- github.com/thecodeteam/goscaleio: [v0.1.0](https://github.com/thecodeteam/goscaleio/tree/v0.1.0)
- github.com/tidwall/pretty: [v1.0.0](https://github.com/tidwall/pretty/tree/v1.0.0)

- `apiserver_dropped_requests` is dropped from this release since `apiserver_request_total` can now be used to track dropped requests. `etcd_object_counts` is also removed in favor of `apiserver_storage_objects`. `apiserver_registered_watchers` is also removed in favor of `apiserver_longrunning_requests`. ([#110337](https://github.com/kubernetes/kubernetes/pull/110337), [@logicalhan](https://github.com/logicalhan))

  - The flag `--experimental-control-plane` is now deprecated in favor of  `--control-plane`. The flag `--experimental-upload-certs` is now deprecated in favor of `--upload-certs` ([#78452](https://github.com/kubernetes/kubernetes/pull/78452),...

- 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

- 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))

  - `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]