</p>

<pre class="grammar">
Syntax      = { Production } .
Production  = production_name "=" [ Expression ] "." .
Expression  = Term { "|" Term } .
Term        = Factor { Factor } .
Factor      = production_name | token [ "…" token ] | Group | Option | Repetition .
Group       = "(" Expression ")" .
Option      = "[" Expression "]" .
Repetition  = "{" Expression "}" .
</pre>

<p>

com/presentation/d/1QUOsQxfEfHlMq4lPjlK2ewQHsr9peEKymDw5_XwZm8Q/edit?usp=sharing)). Bug fixes across bare metal tooling and production-ready user stories, such as the high availability use cases have been given priority for 1.15.

kubeadm, the cluster lifecycle building block, continues to receive features and stability work required for bootstrapping production clusters efficiently. kubeadm has promoted high availability (HA) capability to beta, allowing users to use the familiar `kubeadm...

- [`KT-52934`](https://youtrack.jetbrains.com/issue/KT-52934) StackOverflow from `PseudocodeTraverserKt.collectDataFromSubgraph` with `if` inside `finally`
- [`KT-52860`](https://youtrack.jetbrains.com/issue/KT-52860) StackOverflowError when casting involving recursive generics and star projection

* PVC Protection alpha feature was renamed to Storage Protection. The Storage Protection feature is beta. ([#59052](https://github.com/kubernetes/kubernetes/pull/59052), [@pospispa](https://github.com/pospispa))

### Instrumentation

In v1.9 we focused on improving stability of the components owned by the SIG, including Heapster, Custom Metrics API adapters for Prometheus, and Stackdriver.

now always set to "systemd" unless the user is explicit about it. This requires existing machine setups to configure the container runtime to use the "systemd" driver. Documentation on this topic can be found here: https://kubernetes.io/docs/setup/production-environment/container-runtimes/. When upgrading existing clusters / nodes using "kubeadm upgrade" the old cgroupDriver value is preserved, but in 1.22 this change will also apply to "upgrade". For more information on migrating to the "systemd" driver...

- kube-apiserver

  - the `--basic-auth-file` flag and authentication mode is deprecated and will be removed in a future release. It is not recommended for production environments. ([#81152](https://github.com/kubernetes/kubernetes/pull/81152), [@tedyu](https://github.com/tedyu))

## Changelog since v1.11.0

### Action Required

* ACTION REQUIRED: Removes defaulting of CSI file system type to ext4. All the production drivers listed under https://kubernetes-csi.github.io/docs/drivers.html were inspected and should not be impacted after this change. If you are using a driver not in that list, please test the drivers on an updated test cluster first. ([#65499]...

[SIG Cluster Lifecycle]: https://github.com/kubernetes/community/tree/master/sig-cluster-lifecycle

### SIG Instrumentation

[SIG Instrumentation][] is responsible for metrics production and
collection.

For the 1.8 release, SIG Instrumentation focused on stabilizing the APIs
and components that are required to support the new version of the Horizontal Pod