* Addon manager supports HA masters. ([#55466](https://github.com/kubernetes/kubernetes/pull/55466), [@x13n](https://github.com/x13n))
* - 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

  * Add ip-masq-agent addon to the addons folder which is used in GCE if `--non-masquerade-cidr` is set to 0/0 ([#46038](https://github.com/kubernetes/kubernetes/pull/46038), [@dnardo](https://github.com/dnardo))

  * Enable kubelet csr bootstrap in GCE/GKE ([#40760](https://github.com/kubernetes/kubernetes/pull/40760), [@mikedanese](https://github.com/mikedanese))

* Upgrade Elasticsearch/Kibana to 5.5.1 in fluentd-elasticsearch addon ([#48722](https://github.com/kubernetes/kubernetes/pull/48722), [@aknuds1](https://github.com/aknuds1))
        * Switch to basing our image of Elasticsearch in fluentd-elasticsearch addon off the official one
        * Switch to the official image of Kibana in fluentd-elasticsearch addon

* [stackdriver addon] Bump prometheus-to-sd to v0.5.0 to pick up security fixes. ([#75362](https://github.com/kubernetes/kubernetes/pull/75362), [@serathius](https://github.com/serathius))
    * [fluentd-gcp addon] Bump fluentd-gcp-scaler to v0.5.1 to pick up security fixes.
    * [fluentd-gcp addon] Bump event-exporter to v0.2.4 to pick up security fixes.

### Other notable changes

* [fluentd-gcp-scaler addon] Bump fluentd-gcp-scaler to 0.4 to pick up security fixes. ([#67691](https://github.com/kubernetes/kubernetes/pull/67691), [@loburm](https://github.com/loburm))
    * [prometheus-to-sd addon] Bump prometheus-to-sd to 0.3.1 to pick up security fixes, bug fixes and new features.
    * [event-exporter addon] Bump event-exporter to 0.2.3 to pick up security fixes.

    - [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)

* [stackdriver addon] Bump prometheus-to-sd to v0.5.0 to pick up security fixes. ([#75362](https://github.com/kubernetes/kubernetes/pull/75362), [@serathius](https://github.com/serathius))
    * [fluentd-gcp addon] Bump fluentd-gcp-scaler to v0.5.1 to pick up security fixes.
    * [fluentd-gcp addon] Bump event-exporter to v0.2.4 to pick up security fixes.

- The fluentd-elasticsearch addon is no longer included in the cluster directory. It is available from https://github.com/kubernetes-sigs/instrumentation-addons/tree/master/fluentd-elasticsearch. ([#107553](https://github.com/kubernetes/kubernetes/pull/107553), [@liggitt](https://github.com/liggitt))

- `kubeadm`: Introduced a new feature gate `UpgradeAddonsBeforeControlPlane` to
  fix a kube-proxy skew policy misalignment. Its default value is `false`. Upgrade
  of the CoreDNS and kube-proxy addons will now trigger after all the control plane
  instances have been upgraded, unless the fearure gate is set to true. This feature

- Addons: elasticsearch discovery supports IPv6 ([#85543](https://github.com/kubernetes/kubernetes/pull/85543), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle and Instrumentation]