reintroduce resourcequota.NewMonitor

- this function is used by other packages and  was mistakenly removed
  in 397cc73dc9
- let resource quota controller use this constructor instead of an
  object instantiation

pkg/controller/resourcequota/resource_quota_controller.go

@@ -151,16 +151,15 @@ func NewController(ctx context.Context, options *ControllerOptions) (*Controller
 	)
 
 	if options.DiscoveryFunc != nil {
-		qm := &QuotaMonitor{
-			informersStarted:  options.InformersStarted,
-			informerFactory:   options.InformerFactory,
-			ignoredResources:  options.IgnoredResourcesFunc(),
-			resourceChanges:   workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "resource_quota_controller_resource_changes"),
-			resyncPeriod:      options.ReplenishmentResyncPeriod,
-			replenishmentFunc: rq.replenishQuota,
-			registry:          rq.registry,
-			updateFilter:      options.UpdateFilter,
-		}
+		qm := NewMonitor(
+			options.InformersStarted,
+			options.InformerFactory,
+			options.IgnoredResourcesFunc(),
+			options.ReplenishmentResyncPeriod,
+			rq.replenishQuota,
+			rq.registry,
+			options.UpdateFilter,
+		)
 
 		rq.quotaMonitor = qm
 

pkg/controller/resourcequota/resource_quota_monitor.go

@@ -103,6 +103,20 @@ type QuotaMonitor struct {
 	updateFilter UpdateFilter
 }
 
+// NewMonitor creates a new instance of a QuotaMonitor
+func NewMonitor(informersStarted <-chan struct{}, informerFactory informerfactory.InformerFactory, ignoredResources map[schema.GroupResource]struct{}, resyncPeriod controller.ResyncPeriodFunc, replenishmentFunc ReplenishmentFunc, registry quota.Registry, updateFilter UpdateFilter) *QuotaMonitor {
+	return &QuotaMonitor{
+		informersStarted:  informersStarted,
+		informerFactory:   informerFactory,
+		ignoredResources:  ignoredResources,
+		resourceChanges:   workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "resource_quota_controller_resource_changes"),
+		resyncPeriod:      resyncPeriod,
+		replenishmentFunc: replenishmentFunc,
+		registry:          registry,
+		updateFilter:      updateFilter,
+	}
+}
+
 // monitor runs a Controller with a local stop channel.
 type monitor struct {
 	controller cache.Controller