### 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](https://github.com/kubernetes/kubernetes/pull/65499), [@krunaljain](https://github.com/krunaljain))

* Fixed an issue where Portworx volume driver wasn't passing namespace and annotations to the Portworx Create API. ([#59607](https://github.com/kubernetes/kubernetes/pull/59607), [@harsh-px](https://github.com/harsh-px))

    * ACTION REQUIRED: the alpha CRDs are no longer used and drivers will need to be updated to use the beta APIs.
    * The support for `_` in the CSI driver name will be dropped as the CSI Spec does not allow that. 

### Other notable changes

#### Docker runtime Known Issues

- Kernel crash with Aufs storage driver on Debian Jessie ([#27885](https://github.com/kubernetes/kubernetes/issues/27885))

* Upgrading Container-VM base image for k8s on GCE. Brief changelog as follows: ([#32738](https://github.com/kubernetes/kubernetes/pull/32738), [@Amey-D](https://github.com/Amey-D))
    * Fixed performance regression in veth device driver
    * Docker and related binaries are statically linked
    * Fixed the issue of systemd being oom-killable

  }

  /**
   * Returns a {@link Writer} that simply discards written chars.
   *
   * <p><b>Java 11+ users:</b> use {@link Writer#nullWriter()} instead. Note that the {@link
   * CharStreams} method returns a singleton writer whose {@code close} method has no effect, while
   * the {@link Writer#nullWriter()} method returns a new instance whose methods throw after the
   * instance is {@link Writer#close() closed}.
   *
   * @since 15.0

   * @since 15.0 (in 14.0 with return type {@link BufferedWriter})
   */
  public Writer openBufferedStream() throws IOException {
    Writer writer = openStream();
    return (writer instanceof BufferedWriter)
        ? (BufferedWriter) writer
        : new BufferedWriter(writer);
  }

  /**
   * Writes the given character sequence to this sink.
   *

@GwtIncompatible
final class AppendableWriter extends Writer {
  private final Appendable target;
  private boolean closed;

  /**
   * Creates a new writer that appends everything it writes to {@code target}.
   *
   * @param target target to which to append output
   */
  AppendableWriter(Appendable target) {
    this.target = checkNotNull(target);
  }

  /*
   * Abstract methods from Writer
   */

  @Override

                                writer.write(hit.getSourceAsString());
                                writer.write("\n");
                            } catch (final IOException e) {
                                throw new IORuntimeException(e);
                            }
                            return true;
                        });
                        writer.flush();
                    }

        protected boolean isCommit = false;

        /** Temporary file used for writing updates before committing. */
        protected File newFile;

        /** Writer for outputting content to the temporary file. */
        protected Writer writer;

        /** The mapping item being updated, or null for read-only operations. */
        protected CharMappingItem item;

        /**