"primary IP family" of the cluster by picking a primary pod IP of the same family
  as the (primary) node IP, rather than assuming that the CNI plugin returned the IPs
  in the order the administrator wanted (since some CNI plugins don't allow
  configuring this). ([#97979](https://github.com/kubernetes/kubernetes/pull/97979), [@danwinship](https://github.com/danwinship)) [SIG Network and Node]

    * possible to update the spec field of an existing
    * NetworkPolicy. (Previously you had to delete and recreate a
    * NetworkPolicy if you wanted to change it.)
* Fix udp service blackhole problem when number of backends changes from 0 to non-0 ([#48524](https://github.com/kubernetes/kubernetes/pull/48524), [@freehan](https://github.com/freehan))

  // The grace period is the duration in seconds after the processes running in the pod are sent
  // a termination signal and the time when the processes are forcibly halted with a kill signal.
  // Set this value longer than the expected cleanup time for your process.
  // Defaults to 30 seconds.
  // +optional
  optional int64 terminationGracePeriodSeconds = 4;

#### Security
* Features:

  * Permission to use a PodSecurityPolicy can now be granted within a single namespace by allowing the use verb on the podsecuritypolicies resource within the namespace. ([#42360](https://github.com/kubernetes/kubernetes/pull/42360), [@liggitt](https://github.com/liggitt))

- Fixed code to ensure that pods running on nodes tainted with `NoExecute` continue to run when the `PodDisruptionConditions` feature gate is enabled. ([#112518](https://github.com/kubernetes/kubernetes/pull/112518), [@mimowo](https://github.com/mimowo))

* Fix TestEventChannelFull random fail ([#76603](https://github.com/kubernetes/kubernetes/pull/76603), [@changyaowei](https://github.com/changyaowei))
* `aws-cloud-provider` service account in the `kube-system` namespace need to be granted with list node permission with this optimization ([#76976](https://github.com/kubernetes/kubernetes/pull/76976), [@zhan849](https://github.com/zhan849))

* Tainted nodes by conditions as following: ([#49257](https://github.com/kubernetes/kubernetes/pull/49257), [@k82cn](https://github.com/k82cn))
          * 'node.kubernetes.io/network-unavailable=:NoSchedule' if NetworkUnavailable is true

([#57926](https://github.com/kubernetes/kubernetes/pull/57926), [@wwwtyro](https://github.com/wwwtyro))

* Check for known manifests during preflight instead of only checking for non-empty manifests directory. This makes the preflight checks less heavy-handed by specifically checking for well-known files (kube-apiserver.yaml, kube-controller-manager.yaml, kube-scheduler.yaml, etcd.yaml) in /etc/kubernetes/manifests instead of simply checking for a non-empty directory. ([#57287](https://github.com/kube...

* fixes an issue with multi-line annotations injected via downward API files getting scrambled ([#65992](https://github.com/kubernetes/kubernetes/pull/65992), [@liggitt](https://github.com/liggitt))
* kubeadm: run kube-proxy on non-master tainted nodes ([#65931](https://github.com/kubernetes/kubernetes/pull/65931), [@neolit123](https://github.com/neolit123))

- `/test/e2e/framework`: Adds a flag `non-blocking-taints` which allows tests to run in environments with tainted nodes. String value should be a comma-separated list. ([#81043](https://github.com/kubernetes/kubernetes/pull/81043), [@johnSchnake](https://github.com/johnSchnake))