CKS: Fix transition exception when scaling Stopped k8s clusters (apache#11598)

* add new k8s cluster transition

* apply suggestion

* apply suggestion

Author: bernardodemarco

api/src/main/java/com/cloud/kubernetes/cluster/KubernetesCluster.java

@@ -60,6 +60,7 @@ enum State {
         Stopping("Resources for the Kubernetes cluster are being destroyed"),
         Stopped("All resources for the Kubernetes cluster are destroyed, Kubernetes cluster may still have ephemeral resource like persistent volumes provisioned"),
         Scaling("Transient state in which resources are either getting scaled up/down"),
+        ScalingStoppedCluster("Transient state in which the service offerings of stopped clusters are getting scaled"),
         Upgrading("Transient state in which cluster is getting upgraded"),
         Importing("Transient state in which additional nodes are added as worker nodes to a cluster"),
         RemovingNodes("Transient state in which additional nodes are removed from a cluster"),
@@ -93,8 +94,11 @@ enum State {
             s_fsm.addTransition(State.Running, Event.AutoscaleRequested, State.Scaling);
             s_fsm.addTransition(State.Running, Event.ScaleUpRequested, State.Scaling);
             s_fsm.addTransition(State.Running, Event.ScaleDownRequested, State.Scaling);
+            s_fsm.addTransition(State.Stopped, Event.ScaleUpRequested, State.ScalingStoppedCluster);
             s_fsm.addTransition(State.Scaling, Event.OperationSucceeded, State.Running);
             s_fsm.addTransition(State.Scaling, Event.OperationFailed, State.Alert);
+            s_fsm.addTransition(State.ScalingStoppedCluster, Event.OperationSucceeded, State.Stopped);
+            s_fsm.addTransition(State.ScalingStoppedCluster, Event.OperationFailed, State.Alert);
 
             s_fsm.addTransition(State.Running, Event.UpgradeRequested, State.Upgrading);
             s_fsm.addTransition(State.Upgrading, Event.OperationSucceeded, State.Running);

plugins/integrations/kubernetes-service/src/main/java/com/cloud/kubernetes/cluster/actionworkers/KubernetesClusterScaleWorker.java

@@ -358,7 +358,8 @@ private void validateKubernetesClusterScaleSizeParameters() throws CloudRuntimeE
     private void scaleKubernetesClusterOffering(KubernetesClusterNodeType nodeType, ServiceOffering serviceOffering,
                                                 boolean updateNodeOffering, boolean updateClusterOffering) throws CloudRuntimeException {
         validateKubernetesClusterScaleOfferingParameters();
-        if (!kubernetesCluster.getState().equals(KubernetesCluster.State.Scaling)) {
+        List<KubernetesCluster.State> scalingStates = List.of(KubernetesCluster.State.Scaling, KubernetesCluster.State.ScalingStoppedCluster);
+        if (!scalingStates.contains(kubernetesCluster.getState())) {
             stateTransitTo(kubernetesCluster.getId(), KubernetesCluster.Event.ScaleUpRequested);
         }
         if (KubernetesCluster.State.Created.equals(originalState)) {