add feature gate MaxUnavailableStatefulSet

Author: demonCoder95

cluster/config-defaults.yaml

@@ -841,6 +841,9 @@ enable_hpa_container_metrics: "true"
 # https://kubernetes.io/docs/tasks/debug-application-cluster/debug-running-pod/
 enable_ephemeral_containers: "false"
 
+# Enable FeatureGate MaxUnavailableStatefulSet
+max_unavailable_statefulset_enabled: "false"
+
 # enable encryption of secrets in etcd
 # this flag can be switched between true and false
 # to ensure all secrets are encrypted/decrypted all secrets need to be rewritten after masters have been rolled

cluster/node-pools/master-default/userdata.yaml

@@ -143,7 +143,7 @@ write_files:
           - --oidc-groups-claim=groups
           - "--oidc-groups-prefix=okta:"
 {{- end }}
-          - --feature-gates=HPAScaleToZero={{ .Cluster.ConfigItems.enable_hpa_scale_to_zero }},EphemeralContainers={{ .Cluster.ConfigItems.enable_ephemeral_containers }},HPAContainerMetrics={{ .Cluster.ConfigItems.enable_hpa_container_metrics }},StatefulSetAutoDeletePVC={{ .Cluster.ConfigItems.enable_statefulset_autodelete_pvc }},TopologyAwareHints={{ .Cluster.ConfigItems.enable_topology_aware_hints }},MinDomainsInPodTopologySpread={{ .Cluster.ConfigItems.min_domains_in_pod_topology_spread_enabled }},CronJobTimeZone={{.Cluster.ConfigItems.cronjob_time_zone_enabled}}
+          - --feature-gates=HPAScaleToZero={{ .Cluster.ConfigItems.enable_hpa_scale_to_zero }},EphemeralContainers={{ .Cluster.ConfigItems.enable_ephemeral_containers }},HPAContainerMetrics={{ .Cluster.ConfigItems.enable_hpa_container_metrics }},StatefulSetAutoDeletePVC={{ .Cluster.ConfigItems.enable_statefulset_autodelete_pvc }},TopologyAwareHints={{ .Cluster.ConfigItems.enable_topology_aware_hints }},MinDomainsInPodTopologySpread={{ .Cluster.ConfigItems.min_domains_in_pod_topology_spread_enabled }},CronJobTimeZone={{.Cluster.ConfigItems.cronjob_time_zone_enabled}},MaxUnavailableStatefulSet={{.Cluster.ConfigItems.max_unavailable_statefulset_enabled}}
           - --service-account-key-file=/etc/kubernetes/ssl/service-account-public-key.pem
           - --service-account-signing-key-file=/etc/kubernetes/ssl/service-account-private-key.pem
           - --service-account-issuer={{ .Cluster.APIServerURL }}