* backing collection and the mutex are serializable.
 *
 * <p>If {@code null} is passed as the {@code mutex} parameter to any of this class's top-level
 * methods or inner class constructors, the created object uses itself as the synchronization mutex.
 *
 * <p>This class should be used by other collection classes only.
 *
 * @author Mike Bostock
 * @author Jared Levy
 */
@J2ktIncompatible
@GwtCompatible
/*

    - https://github.com/kubernetes/kubernetes/issues/92272
    - https://github.com/kubernetes/kubernetes/issues/92250
  
    To address this, the new debian-hyperkube-base image (v1.1.0) uses the
    debian-iptables base image (v12.1.0), which includes iptables-wrapper, a

* list-resources: don't fail if the grep fails to match any resources ([#41933](https://github.com/kubernetes/kubernetes/pull/41933), [@ixdy](https://github.com/ixdy))
* Update gcr.io/google-containers/rescheduler to v0.2.2, which uses busybox as a base image instead of ubuntu. ([#41911](https://github.com/kubernetes/kubernetes/pull/41911), [@ixdy](https://github.com/ixdy))

* Forgiveness alpha version api definition ([#39469](https://github.com/kubernetes/kubernetes/pull/39469), [@kevin-wangzefeng](https://github.com/kevin-wangzefeng))
* Rescheduler uses taints in v1beta1 and will remove old ones (in version v1alpha1) right after its start. ([#43106](https://github.com/kubernetes/kubernetes/pull/43106), [@piosz](https://github.com/piosz))

### Volumes

    return CollectCollectors.toImmutableSortedMap(
        comparator, keyFunction, valueFunction, mergeFunction);
  }

  /*
   * TODO(kevinb): Confirm that ImmutableSortedMap is faster to construct and
   * uses less memory than TreeMap; then say so in the class Javadoc.
   */
  private static final Comparator<?> NATURAL_ORDER = Ordering.natural();

  private static final ImmutableSortedMap<Comparable<?>, Object> NATURAL_EMPTY_MAP =

start a new pod. [Storage capacity tracking](https://github.com/kubernetes/enhancements/tree/master/keps/sig-storage/1472-storage-capacity-tracking), a new alpha feature, addresses that by adding an API for a CSI driver to report storage capacity and uses that information in the Kubernetes scheduler when choosing a node for a pod. This feature serves as a stepping stone for supporting dynamic provisioning for local volumes and other volume types that are more capacity constrained.

### CSI...

memory resources

Originally, Kubernetes used the v1 cgroups API. With that design, the QoS class for a pod only applied to CPU resources (such as `cpu_shares`). The Kubernetes cgroup manager uses `memory.limit_in_bytes` in v1 cgroups to limit the memory capacity for a container, and uses `oom_scores` to recommend an order for killing container processes if an out-of-memory event occurs. This implementation has shortcomings: for `Guaranteed` pods, memory can not be fully reserved, and the...

- Fixes kubelet crash in client certificate rotation cases ([#88079](https://github.com/kubernetes/kubernetes/pull/88079), [@liggitt](https://github.com/liggitt)) [SIG API Machinery, Auth and Node]

- Changed how KMS v2 encryption at rest can generate data encryption keys.

- Base-images: Update to debian-iptables:buster-v1.3.0
  - Uses iptables 1.8.5
  - base-images: Update to debian-base:buster-v1.2.0
  - cluster/images/etcd: Build etcd:3.4.13-1 image