* This PR removes the following metrics: ([#74636](https://github.com/kubernetes/kubernetes/pull/74636), [@logicalhan](https://github.com/logicalhan))
    *   reflector_items_per_list
    *   reflector_items_per_watch
    *   reflector_last_resource_version
    *   reflector_list_duration_seconds
    *   reflector_lists_total
    *   reflector_short_watches_total
    *   reflector_watch_duration_seconds

## Changelog since v1.8.12

### Other notable changes

* Add MAX_PODS_PER_NODE env so that user can use it to specify the default max pods per node for the cluster. IP_ALIAS_SIZE will be changed accordingly. Must have ip alias enabled. ([#63466](https://github.com/kubernetes/kubernetes/pull/63466), [@grayluck](https://github.com/grayluck))

- github.com/valyala/tcplisten: ceec8f9
- github.com/vektah/gqlparser: v1.1.2
- go.etcd.io/etcd: 3cf2f69
- go.mongodb.org/mongo-driver: v1.1.2
- go4.org: 417644f
- golang.org/x/build: 2835ba2
- golang.org/x/perf: 6e6d33e
- golang.org/x/xerrors: a985d34
- gopkg.in/alecthomas/kingpin.v2: v2.2.6
- gopkg.in/cheggaaa/pb.v1: v1.0.25
- gopkg.in/resty.v1: v1.12.0
- grpc.go4.org: 11d0a25
- k8s.io/system-validators: v1.0.4

  - "routeTableCacheTTLInSeconds"
  ([#86266](https://github.com/kubernetes/kubernetes/pull/86266), [@zqingqing1](https://github.com/zqingqing1)) [SIG Cloud Provider]

- Added a new command line argument `--interactive` to kubectl. The new command line argument lets a user confirm deletion requests per resource interactively. ([#114530](https://github.com/kubernetes/kubernetes/pull/114530), [@ardaguclu](https://github.com/ardaguclu)) [SIG CLI and Testing]
- Added a new feature gate, `SchedulerQueueingHints` (enabled by default).

* Fixes issue where subpath readOnly mounts failed ([#63045](https://github.com/kubernetes/kubernetes/pull/63045), [@msau42](https://github.com/msau42))
* Add MAX_PODS_PER_NODE env so that GCE/GKE user can use it to specify the default max pods per node for the cluster. IP_ALIAS_SIZE will be changed accordingly. Must have ip alias enabled. ([#63621](https://github.com/kubernetes/kubernetes/pull/63621), [@grayluck](https://github.com/grayluck))

* Add MAX_PODS_PER_NODE env so that GCE/GKE user can use it to specify the default max pods per node for the cluster. IP_ALIAS_SIZE will be changed accordingly. Must have ip alias enabled. ([#63451](https://github.com/kubernetes/kubernetes/pull/63451), [@grayluck](https://github.com/grayluck))

- Introduce a churn operator to scheduler perf testing framework. ([#98900](https://github.com/kubernetes/kubernetes/pull/98900), [@Huang-Wei](https://github.com/Huang-Wei)) [SIG Scheduling and Testing]

New alpha features include:
* Online volume resizing will increase the filesystem size of a resized volume without requiring a Pod restart.
* AWS EBS and GCE PD volumes support increased limits on the maximum number of attached volumes per node.
* Subpath volume directories can be created using DownwardAPI environment variables.

### SIG Windows

This release supports more of Kubernetes API for pods and containers on Windows, including:

* This PR removes the following metrics: ([#74636](https://github.com/kubernetes/kubernetes/pull/74636), [@logicalhan](https://github.com/logicalhan))
    *   reflector_items_per_list
    *   reflector_items_per_watch
    *   reflector_last_resource_version
    *   reflector_list_duration_seconds
    *   reflector_lists_total
    *   reflector_short_watches_total
    *   reflector_watch_duration_seconds