allErrs = append(allErrs, field.Invalid(field.NewPath("spec", "clusterIPs").Index(i), service.Spec.ClusterIPs, "may not change once set"))
			}
		}

	// something has been released (downgraded)
	case len(oldService.Spec.ClusterIPs) > len(service.Spec.ClusterIPs):
		// primary ClusterIP has been released
		if len(service.Spec.ClusterIPs) == 0 {

- [`KT-61078`](https://youtrack.jetbrains.com/issue/KT-61078) K2: Compilation fails in FirSerializer trying to serialize nested class
- [`KT-66372`](https://youtrack.jetbrains.com/issue/KT-66372) KMP: JVM dependency can be downgraded by metadata dependency
- [`KT-66431`](https://youtrack.jetbrains.com/issue/KT-66431) KMP: External Target Compilation friendArtifactResolver throws ClassCastException

  This feature will not be fully enabled until a future Kubernetes release (likely to be v1.29), but is added in v1.28 to enable
  safe rollback on downgrade. ([#118339](https://github.com/kubernetes/kubernetes/pull/118339), [@jpbetz](https://github.com/jpbetz)) [SIG API Machinery, Auth, Cloud Provider and Testing]

- Kubeadm: fix a regression where the KubeletConfiguration is not properly downloaded during "kubeadm upgrade" commands from the kube-system/kubelet-config ConfigMap, resulting in the local '/var/lib/kubelet/config.yaml' file being written as a defaulted config. ([#124497](https://github.com/kubernetes/kubernetes/pull/124497), [...

		newService:         makeServiceWithClusterIp("10.0.0.10", []string{"10.0.0.10", "2000::1"}),
		expectedClusterIP:  "10.0.0.10",
		expectedClusterIPs: []string{"10.0.0.10", "2000::1"},
	}, {
		name:               "update - downgrade",
		oldService:         makeServiceWithClusterIp("10.0.0.10", []string{"10.0.0.10", "2000::1"}),
		newService:         makeServiceWithClusterIp("10.0.0.10", []string{"10.0.0.10"}),
		expectedClusterIP:  "10.0.0.10",

* Fix GCE etcd scripts to pass in all required parameters for the etcd migration utility to correctly perform HA upgrades and downgrades ([#61957](https://github.com/kubernetes/kubernetes/pull/61957), [@jpbetz](https://github.com/jpbetz))