* Exec and portforward actions over SPDY now properly handle redirects sent by the Kubelet ([#44451](https://github.com/kubernetes/kubernetes/pull/44451), [@ncdc](https://github.com/ncdc))

* - Add PodSecurityPolicies for cluster addons ([#55509](https://github.com/kubernetes/kubernetes/pull/55509), [@tallclair](https://github.com/tallclair))
    * - Remove SSL cert HostPath volumes from heapster addons

- Enforced kubelet to request serving certificates only once it has at least one IP address in the `.status.addresses` of its associated Node object. This avoids requesting DNS-only serving certificates before externally set addresses are in place. Until 1.33, the previous behavior can be opted back into by setting the deprecated `AllowDNSOnlyNodeCSR` feature gate to true in the kubelet. ([#125813](https:...

*   PodSecurityPolicies have been added for all in-tree cluster addons ([#55509](https://github.com/kubernetes/kubernetes/pull/55509),[ @tallclair](https://github.com/tallclair))

#### **GCE**

    - [libvirt CoreOS](#libvirt-coreos)
    - [GCE](#gce-1)
    - [OpenStack](#openstack)
    - [Container Images](#container-images)
    - [Other Notable Changes](#other-notable-changes-16)
  - [Changes to Addons](#changes-to-addons)
    - [Dashboard](#dashboard)
    - [DNS](#dns)
    - [DNS Autoscaler](#dns-autoscaler)
    - [Cluster Autoscaler](#cluster-autoscaler-1)
    - [Cluster Load Balancing](#cluster-load-balancing)

  - support for the `v1alpha3` configuration file format is deprecated and will be removed in 1.14. Use `kubeadm config migrate` to migrate `v1alpha3` configuration files to `v1beta1`, which provides improvements in image repository management, addons configuration, and other areas. The documentation for `v1beta1` can be found here: https://godoc.org/k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta1

### Bug or Regression

A security issue was discovered in kube-apiserver that could allow an attacker controlled aggregated API server to redirect client traffic to any URL.  This could lead to the client performing unexpected actions as well as leaking the client's credentials to third parties. 

  -  Don't break metric storage when duplicate pod metrics encountered causing hpa to fail ([#83907](https://github.com/kubernetes/kubernetes/pull/83907), [@olagacek](https://github.com/olagacek))
- addons: elasticsearch discovery supports IPv6 ([#85543](https://github.com/kubernetes/kubernetes/pull/85543), [@SataQiu](https://github.com/SataQiu))

* Improved user experience for environments without a public internet connection and users using other CRI runtimes than Docker
* Support for structured configuration for the kubelet, which avoids the need to modify the systemd drop-in file
* Many improvements to the upgrade process and other bug fixes

### SIG Instrumentation