* [stable] Expose storage usage metrics

  * The available capacity of a given Persistent Volume (PV) is available by calling the Kubernetes metrics API.

* [stable] Volume plugin metrics

- Kubeadm: improved retries when updating node information, in case `kube-apiserver` is temporarily unavailable ([#114176](https://github.com/kubernetes/kubernetes/pull/114176), [@QuantumEnergyE](https://github.com/QuantumEnergyE))

* [alpha] Make locally attached (non-network attached) storage available as a persistent volume source. For more information, see [Storage Volumes - local](https://kubernetes.io/docs/concepts/storage/volumes/#local).

#### Volume Plugins

- Kube-aggregator: renames aggregator_unavailable_apiservice_count metric to aggregator_unavailable_apiservice_total ([#88156](https://github.com/kubernetes/kubernetes/pull/88156), [@p0lyn0mial](https://github.com/p0lyn0mial)) [SIG API Machinery]

    * Change chain name to IP-MASQ to be compatible with the pre-injected masquerade rules.
* If `TaintNodesByCondition` is enabled, add `node.kubernetes.io/unschedulable` and `node.kubernetes.io/network-unavailable` automatically to DaemonSet pods. ([#64954](https://github.com/kubernetes/kubernetes/pull/64954), [@k82cn](https://github.com/k82cn))

- Fixed error "dbus: connection closed by user" after dbus daemon restarts. ([#110496](https://github.com/kubernetes/kubernetes/pull/110496), [@kolyshkin](https://github.com/kolyshkin))
- Fixed image pull failure when `IMDS` is unavailable in kubelet startup. ([#110523](https://github.com/kubernetes/kubernetes/pull/110523), [@andyzhangx](https://github.com/andyzhangx))

    - [Dockershim deprecation](#dockershim-deprecation)
    - [External credential provider for client-go](#external-credential-provider-for-client-go)
    - [CronJob controller v2 is available through feature gate](#cronjob-controller-v2-is-available-through-feature-gate)
    - [PID Limits graduates to General Availability](#pid-limits-graduates-to-general-availability)

*   Azure NSG rules can be consolidated to reduce the likelihood of hitting Azure resource limits (available only in regions where the Augmented Security Groups preview is available).  ([#55740](https://github.com/kubernetes/kubernetes/pull/55740), [@itowlson](https://github.com/itowlson))

- API
  - Ingress resources are now available via `networking.k8s.io/v1beta1`. Ingress resources in `extensions/v1beta1` are deprecated and will no longer be served in v1.18. Existing persisted data is available via the new API group/version  ([#74057](https://github.com/kubernetes/kubernetes/pull/74057), [@liggitt](https://github.com/liggitt))

                }
                return true;
            }
        }
        return false;
    }

    @Override
    public boolean isAvailable() {
        if (available != null) {
            return available;
        }
        if (generatorList != null && !generatorList.isEmpty()) {
            String path = System.getenv("PATH");
            if (path == null) {