- [Container Runtime Interface (CRI)](#container-runtime-interface-cri)
      - [kubelet](#kubelet)
    - [Auth](#auth-1)
    - [Cluster Lifecycle](#cluster-lifecycle-1)
      - [kubeadm](#kubeadm)
      - [kops](#kops)
      - [Cluster Discovery/Bootstrap](#cluster-discoverybootstrap)
      - [Multi-platform](#multi-platform)
      - [Cloud Providers](#cloud-providers)
    - [Network](#network)

## WARNING: etcd backup strongly recommended

Before updating to 1.6, you are strongly recommended to back up your etcd data.
Please consult the installation procedure you are using (kargo, kops, kube-up,
kube-aws, kubeadm etc) for specific advice.

1.6 encourages etcd3, and switching from etcd2 to etcd3 involves a full
migration of data between different storage engines.  You must stop the API

- When pleg channel is full, events are now discarded and count is recorded ([#72709](https://github.com/kubernetes/kubernetes/pull/72709), [@changyaowei](https://github.com/changyaowei))
- Fixed the unexpected `NotReady` status when Node's iops is full if the runtime is dockershim. ([#74389](https://github.com/kubernetes/kubernetes/pull/74389), [@answer1991](https://github.com/answer1991))

  fix some problems, eg with HostPorts. ([#94474](https://github.com/kubernetes/kubernetes/pull/94474), [@danwinship](https://github.com/danwinship)) [SIG Network and Node]
- Increase maximum IOPS of AWS EBS io1 volume to current maximum (64,000). ([#90014](https://github.com/kubernetes/kubernetes/pull/90014), [@jacobmarble](https://github.com/jacobmarble))

## 1.9 Release Notes

## WARNING: etcd backup strongly recommended

Before updating to 1.9, you are strongly recommended to back up your etcd data. Consult the installation procedure you are using (kargo, kops, kube-up, kube-aws, kubeadm etc) for specific advice.