title: Metricbeat not show volume mount under dev filesystem
body: <p>Let me explain the problem and context. This is a server for a database solution. The database was created with docker, and added a volume to the server. Then all docker installation path was moved to the volume added to the server (for security and backup mantain). Then for monitoring, i added a metricbeat agent to capture data, like disk and other stuff, but for this context occurs the problem.</p>
  <p>Im searching for a specific mount (the is a volume mount), and when in terminal type <strong>df -aTh | grep &quot;/dev&quot;</strong> for show filesystem, its show this image:</p>
  <p><a href="https://i.stack.imgur.com/w6Gp1.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/w6Gp1.png" alt="enter image description here" /></a></p>
  <p>Then in metricbeat.yaml i have this configuration for system module:</p>
  <pre><code>- module: system
    period: 30s
    metricsets: [&quot;filesystem&quot;]
    processors:
     - drop_event.when.regexp:
         system.filesystem.mount_point: '^/(sys|cgroup|proc|etc|host|hostfs)($|/)'
  </code></pre>
  <p>Notice in last line i omitted &quot;<strong>dev</strong>&quot; , because i want to obtain the mount volume &quot;/dev/sda&quot; high lighted in the screen shot. But when i discoverd in kibana, that device is not showed, and i dont now why, must be showed.</p>
  <p><a href="https://i.stack.imgur.com/4FyZJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4FyZJ.png" alt="enter image description here" /></a></p>
  <p>Thanks for reading and help :) . All of this if for monitoring, and show data in grafana. But i can't find the filesystem &quot;/dev/sda/&quot;, for the disk dashboard...</p>