title: pm2 process deleted itself, process no longer found
body: <p>We have a process running on Node that killed itself 2 days ago. The following is from the pm2.log</p>
  
  <pre><code>2017-01-04 08:30:47: pm2 has been killed by signal, dumping process list before exit...
  2017-01-04 08:30:47: Deleting process 0
  2017-01-04 08:30:47: Stopping app:main id:0
  2017-01-04 08:30:47: App [main] with id [0] and pid [32528], exited with code [0] via signal [SIGTERM]
  2017-01-04 08:30:47: [PM2] Exited peacefully
  </code></pre>
  
  <p>Restarting process 0 (which is no longer running) now returns:</p>
  
  <pre><code>[PM2] Applying action restartProcessId on app [0](ids: 0)
  [PM2][ERROR] Process 0 not found
  </code></pre>
  
  <p>My understanding is that this is likely a memory issue. Any advice for restoring this process would be appreciated.</p>