- The new feature gate "SidecarContainers" is now available. This feature introduces sidecar containers, a new type of init container that starts before other containers but remains running for the full duration of the pod's lifecycle and will not block pod termination. ([#116429](https://github.com/kubernetes/kubernetes/pull/116429), [@gjkim42](https://github.com/gjkim42)) [SIG API Machinery, Apps, Node, Scheduling and Testing]

* [alpha] [cri-containerd](https://github.com/kubernetes-incubator/cri-containerd): CRI implementation for containerd is now v1.0.0-alpha.0, [[@Random-Liu](https://github.com/Random-Liu)]

  * Feature complete. Support the full CRI API defined in v1.8.
  * Pass all the CRI validation tests and regular node end-to-end tests.
  * An ansible playbook is provided to configure a Kubernetes cri-containerd cluster with kubeadm.

### Bug or Regression

- Client-go: resolves an issue with informers falling back to full list requests when timeouts are encountered, rather than re-establishing a watch. ([#89976](https://github.com/kubernetes/kubernetes/pull/89976), [@liggitt](https://github.com/liggitt)) [SIG API Machinery and Testing]

- Istio addon is unchanged from v1.11, at  0.8.0. See [full Istio release notes](https://istio.io/news/releases/0.x/announcing-0.6/) ([#64537](https://github.com/kubernetes/kubernetes/pull/64537))

## Changelog since v1.18.1

## Changes by Kind

### Bug or Regression

- Client-go: resolves an issue with informers falling back to full list requests when timeouts are encountered, rather than re-establishing a watch. ([#89975](https://github.com/kubernetes/kubernetes/pull/89975), [@liggitt](https://github.com/liggitt)) [SIG API Machinery and Testing]

*   Block Storage (Cinder) V3 is now supported.
*   Load Balancer (Octavia) V2 is now supported, in addition to Neutron LBaaS V2.
*   Neutron LBaas V1 support has been removed.

This work enables Kubernetes to take full advantage of the relevant services as exposed by OpenStack clouds. Refer to the [Cloud Providers](https://kubernetes.io/docs/concepts/cluster-administration/cloud-providers/#openstack) documentation for more information.

### Storage

* Update version of Istio addon from 0.5.1 to 0.6.0. ([#61911](https://github.com/kubernetes/kubernetes/pull/61911), [@ostromart](https://github.com/ostromart))
    * See https://istio.io/news/releases/0.x/announcing-0.6/ for full Isto release notes.
* removed unsafe double RLock in cpumanager ([#62464](https://github.com/kubernetes/kubernetes/pull/62464), [@choury](https://github.com/choury))

- Switch scheduler to generate the merge patch on pod status instead of the full pod ([#103133](https://github.com/kubernetes/kubernetes/pull/103133), [@marwanad](https://github.com/marwanad)) [SIG Scheduling]

* Update version of Istio addon from 0.5.1 to 0.8.0. See [full Istio release notes](https://istio.io/news/releases/0.x/announcing-0.6/).([#64537](https://github.com/kubernetes/kubernetes/pull/64537))
* Update cadvisor godeps to v0.30.0 ([#64800](https://github.com/kubernetes/kubernetes/pull/64800))

   * the default config file is "e2e.yaml/toml/json/..." and the test starts when no such config is found (as before) but if -viper-config is used, the config file must exist
   * -viper-config can be used to select a file with full path, with or without file suffix
   * the csiImageVersion/Registry flags were renamed to storage.csi.imageVersion/Registry