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v1.17 to v1.18

Follow the Regular Upgrading Process.

Upgrading Notable Changes​

API Changes​

  • Introduced OverflowClusterAffinities to PropagationPolicy/ClusterPropagationPolicy API to support overflow cluster resource pools for hybrid cloud scheduling.
  • karmada-scheduler-estimator: Introduced AssumedWorkloads field into the gRPC message MaxAvailableComponentSetsRequest.
  • karmada-scheduler-estimator: Introduced AssumedWorkloads field into the gRPC message MaxAvailableReplicasRequest.
  • karmada-webhook: Now rejects PropagationPolicy and ClusterPropagationPolicy resources that use the Lt or Gt operator in spec.placement.clusterTolerations.
  • scheduler-estimator: Migrated to standard protoc-gen-go for gRPC API generation to support Kubernetes 1.35+. Introduced peer bytes fields for K8s types to ensure compatibility.
    • ReplicaRequirements.resourceRequest has been deprecated in favor of resourceRequestBytes, which stores proto-serialized resource.Quantity objects.
    • ComponentReplicaRequirements.resourceRequest has been deprecated in favor of resourceRequestBytes, which stores proto-serialized resource.Quantity objects.
    • NodeClaim.nodeAffinity has been deprecated in favor of nodeAffinityBytes, which stores a proto-serialized corev1.NodeSelector object.
    • NodeClaim.tolerations has been deprecated in favor of tolerationsBytes, which stores proto-serialized corev1.Toleration objects.

Deprecation​

  • Instrumentation: The deprecated cluster and cluster_name Prometheus metric labels have been removed. The newly introduced member_cluster metric label name will now be used for that purpose moving forward.
  • karmada-controller-manager: The flags --cluster-lease-duration and --cluster-lease-renew-interval-fraction have been removed.
  • karmada-scheduler-estimator: The deprecated Estimator label value for estimating_plugin_extension_point in the estimating_plugin_execution_duration_seconds and estimating_plugin_extension_point_duration_seconds metrics has been removed.
  • karmadactl: The deprecated Etcd.Local.InitImage in Karmada Init Configuration has been removed.

Dependencies​

  • karmada-controller-manager/karmada-agent: Upgraded gopher-lua dependency to v1.1.1.
  • Kubernetes dependencies have been updated to v1.35.3.
  • The base image alpine has been promoted from alpine:3.23.3 to alpine:3.23.4.

Others​

  • karmada-operator-chart: To ensure a smooth upgrade, users must first upgrade to release v1.17.3+ before upgrading to a v1.18.x release.