- If a client makes an API streaming requests and specifies an `application/json;as=Table` content type, the API server now responds with a 406 (Not Acceptable) error.

### Other (Cleanup or Flake)

- Apiserver_request_duration_seconds is promoted to stable status. ([#99925](https://github.com/kubernetes/kubernetes/pull/99925), [@logicalhan](https://github.com/logicalhan)) [SIG API Machinery, Instrumentation and Testing]

    - [Metrics Changes](#metrics-changes)
      - [Added metrics](#added-metrics)
      - [Deprecated/changed metrics](#deprecated/changed-metrics)
    - [Notable Features](#notable-features)
      - [Stable](#stable)
      - [Beta](#beta)
      - [Alpha](#alpha)
- [v1.15.0-beta.1](#v1150-beta1)
  - [Downloads for v1.15.0-beta.1](#downloads-for-v1150-beta1)
    - [Client Binaries](#client-binaries-13)

* [stable] Support Attach and Detach operations for ReadWriteOnce (RWO) volumes that use iSCSI and Fibre Channel plugins.

* [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

- Promoted `NodeInclusionPolicyInPodTopologySpread` to Stable in v1.33 ([#130920](https://github.com/kubernetes/kubernetes/pull/130920), [@kerthcet](https://github.com/kerthcet)) [SIG Apps, Node, Scheduling and Testing]

- This PR will leverage subtests on the existing table tests for the scheduler units. ([#63665](https://github.com/kubernetes/kubernetes/pull/63665), [@xchapter7x](https://github.com/xchapter7x))
- This PR will leverage subtests on the existing table tests for the scheduler units. ([#63666](https://github.com/kubernetes/kubernetes/pull/63666), [@xchapter7x](https://github.com/xchapter7x))

### Volumes
* **[stable]** StorageClass API is promoted to v1 (storage.k8s.io/v1).
* **[stable]** Default storage classes are deployed during installation on Azure, AWS, GCE, OpenStack and vSphere.
* **[stable]** Added ability to populate environment variables from a configmap or secret.

    - [Promoted endPort in Network Policy to Stable](#promoted-endport-in-network-policy-to-stable)
    - [Promoted Local Ephemeral Storage Capacity Isolation to Stable](#promoted-local-ephemeral-storage-capacity-isolation-to-stable)
    - [Promoted core CSI Migration to Stable](#promoted-core-csi-migration-to-stable)
    - [Promoted CSI Ephemeral Volume to Stable](#promoted-csi-ephemeral-volume-to-stable)

- Removed the `CronJobTimeZone` feature gate (the feature is stable and always enabled)
  - Removed the `JobMutableNodeSchedulingDirectives` feature gate (the feature is stable and always enabled)

[@fabianofranz](https://github.com/fabianofranz))

* [alpha] The Kubernetes API supports retrieving tabular output for API resources via a new mime-type application/json;as=Table;v=v1alpha1;g=meta.k8s.io. The returned object (if the server supports it) will be of type meta.k8s.io/v1alpha1 with Table, and contain column and row information related to the resource. Each row will contain information about the resource - by default it will be the object metadata, but callers can add the...