`--node-cidr-mask-size-ipv6 int32`     Default: 64. Mask size for IPv6 node-cidr in dual-stack cluster.

    These 2 flags can be used only for dual-stack clusters. For non dual-stack clusters, continue to use  `--node-cidr-mask-size` flag to configure the mask size.

    The default node cidr mask size for IPv6 was 24 which is now changed to 64. ([#79993](https://github.com/kubernetes/kubernetes/pull/79993), [@aramase](https://github.com/aramase))

- The PodShareProcessNamespace feature to configure PID namespace sharing within a pod has been promoted to beta. ([#66507](https://github.com/kubernetes/kubernetes/pull/66507), [@verb](https://github.com/verb))

## API Changes

* Fix issue in converting AWS volume ID from mount paths ([#36840](https://github.com/kubernetes/kubernetes/pull/36840), [@jingxu97](https://github.com/jingxu97))
* Correct env var name in configure-helper ([#33848](https://github.com/kubernetes/kubernetes/pull/33848), [@mtaufen](https://github.com/mtaufen))

* The deprecated kubelet --configure-cbr0 flag has been removed, and with that the "classic" networking mode as well.  If you depend on this mode, please investigate whether the other network plugins `kubenet` or `cni` meet your needs. ([#34906](https://github.com/kubernetes/kubernetes/pull/34906),...

`kubelet.config.k8s.io` API group, a significant subset of Kubelet configuration can now be [configured via a versioned config file](https://kubernetes.io/docs/tasks/administer-cluster/kubelet-config-file/). Kubernetes v1.10 adds alpha support for the ability to [configure whether containers in a pod should share a single process namespace](https://github.com/kubernetes/enhancements/issues/495), and the CRI has been upgraded to v1alpha2, which adds [support for Windows Container Configuration](https://github.com/k...

- Added a new `ServiceCIDR` type that allows to dynamically configure the cluster range used to allocate `Service ClusterIPs` addresses. ([#116516](https://github.com/kubernetes/kubernetes/pull/116516), [@aojea](https://github.com/aojea))

- Pod spread constraints have been added...

    server.enqueue(
      MockResponse(
        body = "bogus proxy connect response content",
        inTunnel = true,
      ),
    )
    server.enqueue(MockResponse(body = "response"))

    // Configure a single IP address for the host and a single configuration, so we only need one
    // failure to fail permanently.
    client =
      client.newBuilder()
        .sslSocketFactory(

* Set kernel.softlockup_panic =1 based on the flag. ([#38001](https://github.com/kubernetes/kubernetes/pull/38001), [@dchen1107](https://github.com/dchen1107))
* Configure local-up-cluster.sh to handle auth proxies ([#36838](https://github.com/kubernetes/kubernetes/pull/36838), [@deads2k](https://github.com/deads2k))

### Feature

- AWS cloudprovider supports auto-discovering subnets without any kubernetes.io/cluster/<clusterName> tags. It also supports additional service annotation service.beta.kubernetes.io/aws-load-balancer-subnets to manually configure the subnets. ([#97431](https://github.com/kubernetes/kubernetes/pull/97431), [@kishorj](https://github.com/kishorj)) [SIG Cloud Provider]