* Pods are placed under a new cgroup hierarchy by default. This feature requires
    draining and restarting the node as part of upgrades. To opt-out set
    `--cgroups-per-qos=false`.
  * If `kube-reserved` and/or `system-reserved` are specified, node allocatable
    will be enforced on all pods by default. To opt-out set
    `--enforce-node-allocatable=””`
  * Hard Eviction Thresholds will be subtracted from Capacity while calculating

- Scheduler changes its logic of calculating `evaluatedNodes` from "contains the number of nodes that filtered out by PreFilterResult and Filter plugins" to "the number of nodes filtered out by Filter plugins only". ([#124735](https://github.com/kubernetes/kubernetes/pull/124735), [@AxeZhan](https://github.com/AxeZhan))

### SIG AWS

In v1.13 we worked on tighter integrations of Kubernetes API objects with AWS services. These include three out-of-tree alpha feature releases:

1) Alpha for AWS ALB (Application Load Balancer) integration to Kubernetes Ingress resources.

* fixes an out of range panic in the NoExecuteTaintManager controller when running a non-64-bit build ([#65596](https://github.com/kubernetes/kubernetes/pull/65596), [@liggitt](https://github.com/liggitt))

* Fixes a goroutine leak in kube-apiserver when a request times out. ([#83333](https://github.com/kubernetes/kubernetes/pull/83333), [@lavalamp](https://github.com/lavalamp))

* [action required] kubeadm join: Error out if CA pinning isn't used or opted out of ([#55468](https://github.com/kubernetes/kubernetes/pull/55468), [@yuexiao-wang](https://github.com/yuexiao-wang))

* Fixed issue 63608, which is that under rare circumstances the ResourceQuota admission controller could lose track of an request in progress and time out after waiting 10 seconds for a decision to be made. ([#64598](https://github.com/kubernetes/kubernetes/pull/64598), [@MikeSpreitzer](https://github.com/MikeSpreitzer))

- EndpointSlice Mirroring controller now cleans up managed EndpointSlices when a Service selector is added (#106136, @robscott) [SIG Apps, Network and Testing]
- Fix concurrent map access causing panics when logging timed-out API calls. (#106124, @marseel) [SIG API Machinery]
- Support more than 100 disk mounts on Windows (#105673, @andyzhangx) [SIG Storage and Windows]

## Dependencies

### Added
_Nothing has changed._

uses `oom_scores` to recommend an order for killing container processes if an out-of-memory event occurs. This implementation has shortcomings: for `Guaranteed` pods, memory can not be fully reserved, and the page cache is at risk of being recycled. For `Burstable` pods, overcommitting memory (setting `request` less than `limit` ) could increase the risk of a container being killed when the Linux kernel detects an out of memory condition.

As an alpha feature, Kubernetes v1.22 can use...

#### Cloud Provider Support
* [alpha] Improved support for out-of-tree and out-of-process cloud providers, a.k.a pluggable cloud providers. See [Build and Run cloud-controller-manager](https://kubernetes.io/docs/tasks/administer-cluster/running-cloud-controller) documentation.