Pacific/Pitcairn Pacific/Pohnpei Pacific/Ponape Pacific/Port_Moresby Pacific/Rarotonga Pacific/Saipan Pacific/Samoa Pacific/Tahiti Pacific/Tarawa Pacific/Tongatapu Pacific/Truk Pacific/Wake Pacific/Wallis Pacific/Yap Poland Portugal ROC ROK Singapore Turkey UCT US/Alaska US/Aleutian US/Arizona US/Central US/East-Indiana US/Eastern US/Hawaii US/Indiana-Starke US/Michigan US/Mountain US/Pacific US/Samoa UTC Universal W-SU WET Zulu...

  `volume_manager_total_volumes`
  ([#84907](https://github.com/kubernetes/kubernetes/pull/84907), [@RainbowMango](https://github.com/RainbowMango))
- Deprecated metric `rest_client_request_latency_seconds` has been turned off. ([#83836](https://github.com/kubernetes/kubernetes/pull/83836), [@RainbowMango](https://github.com/RainbowMango))
- Following metrics from kubelet are now marked as with the ALPHA stability level:

- The feature-gate CSIMigrationPortworx was promoted to beta in Kubernetes 1.25, but turned off by default. In 1.31, it was turned on by default. Before upgrading to 1.31, please make sure that the corresponding portworx csi driver is installed if you are using Portworx. ([#125016](https://github.com/kubernetes/kubernetes/pull/125016), [@carlory](https://github.com/carlory))...

  * Hard Eviction Thresholds will be subtracted from Capacity while calculating
    Node Allocatable. This will result in a reduction of schedulable capacity in
    clusters post upgrade where kubelet hard eviction has been turned on for
    memory. To opt-out set `--experimental-allocatable-ignore-eviction=true`.
  * More details on these feature here:
    https://kubernetes.io/docs/tasks/administer-cluster/reserve-compute-resources/

    * + to use:
    * A new service spec field `Service.Spec.IPFamily` has been added. The default of this field is family of (first service cidr in --service-cluster-ip-range flag). The value is defaulted as described above  once the feature gate is turned on. Here are the possible values for this field:

- Controller manager serve workqueue metrics ([#87967](https://github.com/kubernetes/kubernetes/pull/87967), [@zhan849](https://github.com/zhan849)) [SIG API Machinery]
- Following metrics have been turned off:
  - kubelet_pod_worker_latency_microseconds
  - kubelet_pod_start_latency_microseconds
  - kubelet_cgroup_manager_latency_microseconds
  - kubelet_pod_worker_start_latency_microseconds

- Promoted the feature gate `ValidtaingAdmissionPolicy` to beta, and it is turned off by default. ([#119409](https://github.com/kubernetes/kubernetes/pull/119409), [@alexzielenski](https://github.com/alexzielenski))

  - A custom resource is considered to participate the spec/status convention if and only if the "CustomResourceSubresources" feature gate is turned on and the CRD has `.spec.subresources.status={}`.
- Fixed patch/update operations on multi-version custom resources ([#70087](https://github.com/kubernetes/kubernetes/pull/70087), [@liggitt](https://github.com/liggitt))

After migration, Kubernetes users may continue to rely on all the functionality of in-tree storage plugins using the existing interface.
- CSI Migration feature is turned on by default but stays in Beta for GCE PD, AWS EBS, and Azure Disk in 1.23.
- CSI Migration is introduced as an Alpha feature for Ceph RBD and Portworx in 1.23.

## Urgent Upgrade Notes 

- Fixed resource deletion failure caused by quota calculation error when `InPlacePodVerticalScaling` is turned on. ([#122701](https://github.com/kubernetes/kubernetes/pull/122701), [@carlory](https://github.com/carlory))