implement EnqueueExtensions interface in noderesources

pkg/scheduler/framework/plugins/noderesources/fit.go

@@ -35,6 +35,7 @@ import (
 
 var _ framework.PreFilterPlugin = &Fit{}
 var _ framework.FilterPlugin = &Fit{}
+var _ framework.EnqueueExtensions = &Fit{}
 
 const (
 	// FitName is the name of the plugin used in the plugin registry and configurations.
@@ -189,6 +190,18 @@ func getPreFilterState(cycleState *framework.CycleState) (*preFilterState, error
 	return s, nil
 }
 
+// EventsToRegister returns the possible events that may make a Pod
+// failed by this plugin schedulable.
+// NOTE: if in-place-update (KEP 1287) gets implemented, then PodUpdate event
+// should be registered for this plugin since a Pod update may free up resources
+// that make other Pods schedulable.
+func (f *Fit) EventsToRegister() []framework.ClusterEvent {
+	return []framework.ClusterEvent{
+		{Resource: framework.Pod, ActionType: framework.Delete},
+		{Resource: framework.Node, ActionType: framework.Add | framework.UpdateNodeAllocatable},
+	}
+}
+
 // Filter invoked at the filter extension point.
 // Checks if a node has sufficient resources, such as cpu, memory, gpu, opaque int resources etc to run a pod.
 // It returns a list of insufficient resources, if empty, then the node has all the resources requested by the pod.