func (c *Controller) deleteServiceCIDR(obj interface{}) {
	key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
	if err == nil {
		c.queue.Add(key)
	}
}

// addIPAddress may block a ServiceCIDR deletion
func (c *Controller) addIPAddress(obj interface{}) {
	ip, ok := obj.(*networkingapiv1alpha1.IPAddress)
	if !ok {
		return
	}

	for _, cidr := range c.containingServiceCIDRs(ip) {
		c.queue.Add(cidr)