title: pm2 memory usage and number of processes keeps going up
body: <p>I'm running a node's project on a server with <code>8G of RAM</code> and <code>8 Core of CPU</code> running <code>Ubuntu OS</code>.
  I've created <code>4 instances</code> of my project but what I'm seeing now is lots of processes using lots of RAM (about 7.5G out of 8G).</p>
  <p>How can I manage and remove extra processes keep memory usage in a proper value?</p>
  <p>PM2 Version: <code>4.4.1</code> <br />
  Ubuntu Version: <code>18.04</code><br />
  NodeJS Version: <code>10.22.0</code></p>
  <p>here you can see <code>htop</code> result:
  <a href="https://i.stack.imgur.com/opF9f.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/opF9f.png" alt="htop result" /></a></p>