- A namespaced object with an ownerReference referencing a uid of a namespaced kind which does not exist in the same namespace is now consistently treated as though that owner does not exist, and the child object is deleted.

### Bug or Regression

- Fixes a spurious "namespace not found" error possible in default configurations in 1.30+ when using ValidatingAdmissionPolicy or MutatingAdmissionPolicy to intercept namespaced objects in newly-created namespaces ([#135444](https://github.com/kubernetes/kubernetes/pull/135444), [@lalitc375](https://github.com/lalitc375)) [SIG API Machinery]

### SIG Service Catalog

The Service Plan Defaults feature is still under active development.
We continue to improve the UX for the svcat CLI, specifically filling in gaps for the new Namespaced Service Broker feature.

### SIG Storage

* Admission webhooks rules can now limit scope to only match namespaced, or only cluster-scoped resources with a `scope: "Cluster" | "Namespaced" | "*"` field. ([#74477](https://github.com/kubernetes/kubernetes/pull/74477), [@liggitt](https://github.com/liggitt))

- Fixes a spurious "namespace not found" error possible in default configurations in 1.30+ when using ValidatingAdmissionPolicy or MutatingAdmissionPolicy to intercept namespaced objects in newly-created namespaces ([#135443](https://github.com/kubernetes/kubernetes/pull/135443), [@lalitc375](https://github.com/lalitc375)) [SIG API Machinery]

- Fixes an issue that can result in namespaced custom resources being orphaned when their namespace is deleted, if the CRD defining the custom resource is removed concurrently with namespaces being deleted, then recreated. ([#93790](https://github.com/kubernetes/kubernetes/pull/93790), [@liggitt](https://github.com/liggitt)) [SIG API Machinery and Apps]

* fix a bug that overwhelming number of prometheus metrics are generated because $NAMESPACE is not replaced by string "{namespace}" ([#68530](https://github.com/kubernetes/kubernetes/pull/68530), [@wenjiaswe](https://github.com/wenjiaswe))

  For more information, see [#47131](https://github.com/kubernetes/kubernetes/issues/47131)

*   If a namespaced resource is owned by a cluster scoped resource, and the namespaced dependent is processed before the cluster scoped owner has ever been observed by the garbage collector, the dependent will be erroneously deleted.

### SIG-service-catalog
- The Originating Identity feature, which lets the broker know which user that performed an action, is now GA.
- [Namespaced Brokers](https://svc-cat.io/docs/namespaced-broker-resources/), which enable operators to install a broker into a namespace instead of the cluster level, reached GA.

- Object count quota is now supported for namespaced custom resources using the `count/<resource>.<group>` syntax. ([#72384](https://github.com/kubernetes/kubernetes/pull/72384), [@zhouhaibing089](https://github.com/zhouhaibing089))