broadcast(event, payload) {
    const messageId = this.publisher.sendClusterWideEvent(event, payload);

    debug(
      '[%s] Emitted cluster-wide event "%s" (message: %d)',
      this.nodeId,
      event,
      messageId,
    );
  }
Broadcasts an event to other nodes

@param {string} event name
@param {Object} payload - event payload