Add flag to allow setting a shutdown grace period

internal/ingress/controller/controller.go

@@ -106,6 +106,8 @@ type Configuration struct {
 	MaxmindEditionFiles []string
 
 	MonitorMaxBatchSize int
+
+	ShutdownGracePeriod int
 }
 
 // GetPublishService returns the Service used to set the load-balancer status of Ingresses.

internal/ingress/controller/nginx.go

@@ -367,6 +367,8 @@ func (n *NGINXController) Stop() error {
 		return fmt.Errorf("shutdown already in progress")
 	}
 
+	time.Sleep(time.Duration(n.cfg.ShutdownGracePeriod) * time.Second)
+
 	klog.InfoS("Shutting down controller queues")
 	close(n.stopCh)
 	go n.syncQueue.Shutdown()