## Introduction to 1.9.0

Kubernetes version 1.9 includes new features and enhancements, as well as fixes to identified issues. The release notes contain a brief overview of the important changes introduced in this release. The content is organized by Special Interest Group ([SIG](https://github.com/kubernetes/community/blob/master/sig-list.md)).

  attempted first, and if it fails with a corrupt resource error then it triggers unsafe delete.
  In addition, when this feature is enabled, the 'details' field of 'Status' from the LIST response
  includes information that identifies the corrupt object(s).
  NOTE: unsafe deletion ignores finalizer constraints, and skips precondition checks.
  WARNING: this may break the workload associated with the resource being unsafe-deleted, if it relies on

* Docker versions 1.10.3 - 1.12.3
  * Docker version 1.11.2 known issues
    - Kernel crash with Aufs storage driver on Debian Jessie ([#27885]((https://github.com/kubernetes/kubernetes/issues/27885))
      which can be identified by the [node problem detector](http://kubernetes.io/docs/admin/node-problem/)
    - Leaked File descriptors ([#275](https://github.com/docker/containerd/issues/275))

* rkt: Convert image name to be a valid acidentifier ([#34375](https://github.com/kubernetes/kubernetes/pull/34375), [@euank](https://github.com/euank))

*  `tf.image`
    * Adds JPEG XL support in decode_image.

### Bug Fixes and Other Changes

* `tf.data`
    * Adds `NoneTensorSpec` to the public API so that `None`s in `element_spec`
      can be identified via `isinstance(..., tf.NoneTensorSpec)`.

## Thanks to our Contributors

This release contains contributions from many people at Google, as well as:

* You must now specify `Node.Spec.ConfigSource.ConfigMap.KubeletConfigKey` when using dynamic Kubelet config to tell the Kubelet which key of the `ConfigMap` identifies its config file. ([#59847](https://github.com/kubernetes/kubernetes/pull/59847), [@mtaufen](https://github.com/mtaufen))

    * Docker version 1.11.2 known issues

        * Kernel crash with Aufs storage driver on Debian Jessie ([#27885](https://github.com/kubernetes/kubernetes/pull/27885)) which can be identified by the [node problem detector](https://kubernetes.io/docs/tasks/debug-application-cluster/monitor-node-health/)

        * Leaked File descriptors ([#275](https://github.com/docker/containerd/issues/275))

- Audit events for API requests to deprecated API versions now include a `"k8s.io/deprecated": "true"` audit annotation. If a target removal release is identified, the audit event includes a `"k8s.io/removal-release": "<majorVersion>.<minorVersion>"` audit annotation as well. ([#92842](https://github.com/kubernetes/kubernetes/pull/92842), [@liggitt](https://github.com/liggitt)) [SIG API Machinery and Instrumentation]...

    * no shared pid namespace support
  * Docker version 1.11.2 known issues
    * Kernel crash with Aufs storage driver on Debian Jessie ([#27885](https://github.com/kubernetes/kubernetes/issues/27885))
      which can be identified by the [node problem detector](http://kubernetes.io/docs/admin/node-problem/)
    * Leaked File descriptors ([#275](https://github.com/docker/containerd/issues/275))

- User Assigned MSI (https://docs.microsoft.com/en-us/azure/active-directory/managed-service-identity/overview), which provides for managed identities, is now suppored for Kubernetes clusters on Azure. ([#66180](https://github.com/kubernetes/kubernetes/pull/66180), [@kkmsft](https://github.com/kkmsft))