- `StatefulSet` names must be DNS labels, rather than subdomains. Any `StatefulSet`
  which took advantage of subdomain validation (by having dots in the name) can't
  possibly have worked, because we eventually set `pod.spec.hostname` from the `StatefulSetName`,

* The ScaleIO volume plugin can now read the SDC GUID value as node label scaleio.sdcGuid; if binary drv_cfg is not installed, the plugin will still work properly; if node label not found, it defaults to drv_cfg if installed. ([#50780](https://github.com/kubernetes/kubernetes/pull/50780), [@vladimirvivien](https://github.com/vladimirvivien))

- Indexed Job pods now have the pod completion index set as a pod label. ([#118883](https://github.com/kubernetes/kubernetes/pull/118883), [@danielvegamyhre](https://github.com/danielvegamyhre)) [SIG Apps]

- Added the `access_mode` label to `volume_manager_selinux_*` metrics. ([#123667](https://github.com/kubernetes/kubernetes/pull/123667), [@jsafrane](https://github.com/jsafrane))
- Enhanced cloud provider integrations to support optional, per-Node custom labels that can be supplied and applied to Nodes by the node controller. These extra labels will only be applied where the cloud provider integration supports this feature.

- '`metav1.LabelSelectors` specified in API objects are now validated to ensure
  they do not contain invalid label values that will error at time of use. Existing
  invalid objects can be updated, but new objects are required to contain valid
  label selectors.'
   ([#113699](https://github.com/kubernetes/kubernetes/pull/113699), [@liggitt](https://github.com/liggitt))

- The `volume_zone` plugin will consider `beta` labels as `GA` labels during the scheduling
  process. Therefore, if the values of the labels are the same, PVs with `beta` labels
  can also be scheduled to nodes with `GA` labels. ([#118923](https://github.com/kubernetes/kubernetes/pull/118923), [@AxeZhan](https://github.com/AxeZhan))