title: Simple way to send events or messages between PM2 instances
body: <p>I am looking for the simplest way to communicate a message to all the clusters of PM2, something as simple as using eventEmitter "emit" and "on" functions.</p>
  
  <p>I would like to avoid using third party tools like RabbitMQ and rely only on native Node or NPM.
  So far I've looked at</p>
  
  <ul>
  <li>ipchannel, which is a very simple solution but stops working when the PM2 process reloads</li>
  <li>distributed-eventemitter, which requires STOMP and make the whole setup more complicated</li>
  </ul>
  
  <p>I'm looking forward to your suggestions</p>