- During device plugin allocation, resources requested by the pod can only be allocated if the device plugin has registered itself to kubelet AND healthy devices are present on the node to be allocated. If these conditions are not sattisfied, the pod would fail with `UnexpectedAdmissionError` error. ([#116337](https://github.com/kube...

The use of dual-stack networking is not mandatory.
Although clusters are enabled to support dual-stack networking, Pods and Services continue to default to single-stack.
To use dual-stack networking: Kubernetes nodes have routable IPv4/IPv6 network interfaces, a dual-stack capable CNI network plugin is used, Pods are configured to be dual-stack and Services have their `.spec.ipFamilyPolicy` field set to either `PreferDualStack` or `RequireDualStack`.

- During device plugin allocation, resources requested by the pod can only be allocated if the device plugin has registered itself to kubelet AND healthy devices are present on the node to be allocated. If these conditions are not sattsfied, the pod would fail with `UnexpectedAdmissionError` error. ([#116376](https://github.com/kuber...

				*filter
				COMMIT
				*nat
				:KUBE-SERVICES - [0:0]
				-A KUBE-SERVICES -m comment --comment "ns2/svc2:p80 cluster IP" svc2 line 1
				-A KUBE-SERVICES -m comment --comment ns2/svc2 svc2 line 2
				-A KUBE-SERVICES -m comment --comment "ns2/svc2 blah" svc2 line 3
				-A KUBE-SERVICES -m comment --comment "ns1/svc1:p80 cluster IP" svc1 line 1
				-A KUBE-SERVICES -m comment --comment ns1/svc1 svc1 line 2

* Fix issue where on re-registration of device plugin, `allocatable` was not getting updated. This issue makes devices invisible to the Kubelet if device plugin restarts. Only work-around, if this fix is not there, is to restart the kubelet and then start device plugin. ([#63118](https://github.com/kubernetes/kubernetes/pull/63118), [@vikaschoudhary16](https://github.com/vikaschoudhary16))

IPv4/IPv6 dual-stack has been reimplemented for 1.20 to support dual-stack Services, based on user and community feedback. If your cluster has dual-stack enabled, you can create Services which can use IPv4, IPv6, or both, and you can change this setting for existing Services. Details are available in updated [IPv4/IPv6 dual-stack docs](https://docs.k8s.io/concepts/services-networking/dual-stack/), which cover the nuanced array of options.

    <glob pattern="*.udeb"/>
  </mime-type>

  <mime-type type="application/x-dex">
    <acronym>DEX</acronym>
    <_comment>Dalvik Executable Format</_comment>
    <tika:link>http://source.android.com/devices/tech/dalvik/dex-format.html</tika:link>
    <magic priority="50">
      <match value="dex\n" type="string" offset="0">
        <match value="\0" type="string" offset="7"/>
      </match>
    </magic>

  // CHECK: return %[[RESULT]]
  %cst_0_1d = "tf.Const"() {device = "", value = dense<0> : tensor<1xi32>} : () -> tensor<1xi32>
  %cst_1_0d = "tf.Const"() {device = "", value = dense<1> : tensor<i32>} : () -> tensor<i32>
  %cst_1_1d = "tf.Const"() {device = "", value = dense<1> : tensor<1xi32>} : () -> tensor<1xi32>
  %cst_512_0d = "tf.Const"() {device = "", value = dense<512> : tensor<i32>} : () -> tensor<i32>

mount option.\n\nWhen \"true\", the CSI driver must ensure that all volumes provided by this CSI driver can be mounted separately with different `-o context` options. This is typical for storage backends that provide volumes as filesystems on block devices or as independent shared volumes. Kubernetes will call NodeStage / NodePublish with \"-o context=xyz\" mount option when mounting a ReadWriteOncePod volume used in Pod that has explicitly set SELinux context. In the future, it may be expanded to other...

* Cluster federation servers have changed the location in etcd where federated services are stored, so existing federated services must be deleted and recreated. Before upgrading, export all federated services from the federation server and delete the services. After upgrading the cluster, recreate the federated services from the exported data. ([#37770](https://github.com/kubernetes/kubernetes/pull/37770), [@enj](https://github.com/enj))