protected function addLabelChannels(ResourceEvent $event)
    {
        $nodeId = $event->getResourceIdList()[0];
        $node   = $this->entityManager->getStorage('node')->load($nodeId);
        $items  = field_get_items('node', $node, 'labels');

        if ($items) {
            foreach ($items as $item) {
                $event->addResourceChanId('label', $item['tid']);
            }
        }
    }