- Adds a metric `apiserver_request_error_total` to kube-apiserver. This metric tallies the number of `request_errors` encountered by verb, group, version, resource, subresource, scope, component, and code. ([#83427](https://github.com/kubernetes/kubernetes/pull/83427), [@logicalhan](https://github.com/logicalhan))

### API Change

- 1. PodAffinityTerm includes a namespaceSelector field to allow selecting eligible namespaces based on their labels. 

### Not Very Notable (that is, non-user-facing)

- Unit tests have been added for scopes and scope selectors in the quota spec ([#66351](https://github.com/kubernetes/kubernetes/pull/66351), [@vikaschoudhary16](https://github.com/vikaschoudhary16)) Courtesy of SIG Node, and SIG Scheduling

* Add 'kubectl set resources' ([#27206](https://github.com/kubernetes/kubernetes/pull/27206), [@JacobTanenbaum](https://github.com/JacobTanenbaum))
* Support trust id as a scope in the OpenStack authentication logic ([#32111](https://github.com/kubernetes/kubernetes/pull/32111), [@MatMaul](https://github.com/MatMaul))

The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor first
distributes such Contribution.

2.3. Limitations on Grant Scope

The licenses granted in this Section 2 are the only rights granted under
this License. No additional rights or licenses will be implied from the
distribution or licensing of Covered Software under this License.

    *   Multi Attach PVC errors and events are now more useful and less noisy. ([#53401](https://github.com/kubernetes/kubernetes/pull/53401),[ @gnufied](https://github.com/gnufied))
    *   The compute-rw scope has been removed from GCE nodes ([#53266](https://github.com/kubernetes/kubernetes/pull/53266),[ @mikedanese](https://github.com/mikedanese))

- Fix incorrect calculation for ResourceQuota with PriorityClass as its scope. ([#117828](https://github.com/kubernetes/kubernetes/pull/117828), [@Huang-Wei](https://github.com/Huang-Wei)) [SIG API Machinery]

- Added `apiserver_watch_list_duration_seconds` metrics which will measure response latency distribution in seconds for watchlist requests broken by group, version, resource and scope. ([#120490](https://github.com/kubernetes/kubernetes/pull/120490), [@p0lyn0mial](https://github.com/p0lyn0mial))

- kubeadm: switched the kube-scheduler static Pod to use the endpoints `/livez` (for startup and liveness probes) and `/readyz` (for the readiness probe). Previously, `/healthz` was used for all probes, which is deprecated behavior in the scope of this component. ([#126945](https://github.com/kubernetes/kubernetes/pull/126945), [@liangyuanpeng](https://github.com/liangyuanpeng)) [SIG Cluster Lifecycle]

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