- When using Services with SessionAffinity, client affinity for an
      endpoint now gets broken when that endpoint becomes non-ready
      (rather than continuing until the endpoint is fully deleted).
  
    - Traffic to a service IP now starts getting rejected (as opposed to
      merely dropped) as soon as there are no longer any *usable*
      endpoints, rather than waiting until all of the terminating

- Fixed mounting of iSCSI volumes over IPv6 networks. ([#110688](https://github.com/kubernetes/kubernetes/pull/110688), [@jsafrane](https://github.com/jsafrane))
- Fixed performance issue when creating large objects using SSA with fully unspecified schemas ( preserveUnknownFields ). ([#111557](https://github.com/kubernetes/kubernetes/pull/111557), [@alexzielenski](https://github.com/alexzielenski))

### Refactors

* ⬆️ Upgrade and fully migrate to Ruff, remove isort, includes a couple of tweaks suggested by the new version of Ruff. PR [#9660](https://github.com/tiangolo/fastapi/pull/9660) by [@tiangolo](https://github.com/tiangolo).

- Fix performance issue when creating large objects using SSA with fully unspecified schemas (preserveUnknownFields). ([#111915](https://github.com/kubernetes/kubernetes/pull/111915), [@aojea](https://github.com/aojea)) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Cluster Lifecycle, Instrumentation, Storage...