* Use "k8s.gcr.io" for container images rather than "gcr.io/google_containers".  This is just a redirect, for now, so should not impact anyone materially.   ([#54174](https://github.com/kubernetes/kubernetes/pull/54174), [@thockin](https://github.com/thockin))
    * Documentation and tools should all convert to the new name. Users should take note of this in case they see this new name in the system.

#### Network
- EndpointSlices: If upgrading a cluster with EndpointSlices already enabled, any EndpointSlices that should be managed by the EndpointSlice controller should have a `endpointslice.kubernetes.io/managed-by` label set to `endpointslice-controller.k8s.io`.

#### Scheduling

* The kubelet `--rotate-certificates` flag is now deprecated,...

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. 

There is no mitigation from this issue.  Cluster admins should take care to secure aggregated API servers and should not grant access to mutate `APIService`s to untrusted parties.

CSI Driver. The in-tree AWS OpenStack Cinder driver "kubernetes.io/cinder" was deprecated in 1.16 and will be removed in 1.20. Users should enable CSIMigration + CSIMigrationOpenStack features and install the OpenStack Cinder CSI Driver (https://github.com/kubernetes/cloud-provider-openstack) to avoid disruption to existing Pod and PVC objects at that time. Users should start using the OpenStack Cinder CSI Driver directly for any new volumes. ([#85637](https://github.com/kubernetes/kubernetes/pull/85637),...

 ([#73001](https://github.com/kubernetes/kubernetes/pull/73001), [@shivnagarajan](https://github.com/shivnagarajan))

- Recognize newer docker versions without -ce/-ee suffix: 18.09.0 ([#71001](https://github.com/kubernetes/kubernetes/pull/71001), [@thomas-riccardi](https://github.com/thomas-riccardi))
- Any external provider should be aware the cloud-provider interface should be imported from :- cloudprovider "k8s.io/cloud-provider" ([#68310](https://github.com/kubernetes/kubernetes/pull/68310), [@cheftako](https://github.com/cheftako))

* ACTION REQUIRED: kubeadm: the mixture of "--config" and "--certificate-key" is no longer allowed. The InitConfiguration and JoinConfiguration objects now support the "certificateKey" field and this field should be used instead of the command line argument in case a...

- In order to enable dual-stack support within kubeadm and kubernetes components, as part of the init config file, the user should set feature-gate `IPv6DualStack=true` in the ClusterConfiguration. Additionally, for each worker node, the user should set the feature-gate for kubelet using either `nodeRegistration.kubeletExtraArgs` or `KUBELET_EXTRA_ARGS`. ([#80531](https://github.com/kubernetes/kubernetes/pull/80531), [@Arvinderpal](h...

redirection from ci/latest.txt to ci-cross/latest.txt. Users should know exactly where the builds are stored on Google Cloud storage buckets from now on. For example for 1.9 and 1.10, users can specify ci/latest-1.9 and ci/latest-1.10 as the CI build jobs what build images correctly updates those. The CI jobs for master update the ci-cross/latest location, so if you are looking for latest master builds, then the correct parameter to use would be ci-cross/latest. ([#63504](https://github.com/kubernet...