fix: reset address_set when delete subnet

pkg/controller/subnet.go

@@ -557,6 +557,21 @@ func (c *Controller) handleDeleteSubnet(key string) error {
 		}
 	}
 
+	subnetList, err := c.subnetsLister.List(labels.Everything())
+	if err != nil {
+		klog.Errorf("failed to list subnets %v", err)
+		return err
+	}
+	cidrs := make([]string, 0, len(subnetList))
+	for _, sub := range subnetList {
+		if sub.Status.IsReady() {
+			cidrs = append(cidrs, sub.Spec.CIDRBlock)
+		}
+	}
+	if err := c.ovnClient.SetAddressesToAddressSet(cidrs, util.SubnetAddressSet); err != nil {
+		klog.Errorf("failed to set subnet address set, %v", err)
+		return err
+	}
 	return nil
 }