title: Monitor specific disk spaces on Jenkins nodes
body: <p>Currently Jenkins master can do a "preventive monitoring" of the nodes in the "/computer/configure" page but it is only possible to monitor 2 disk spaces :</p>
  
  <ul>
  <li>$JENKINS_HOME</li>
  <li>Temp Space</li>
  </ul>
  
  <p>I would like to monitor other disk spaces. For example, the /var/lib/docker (default directory where all docker images are pulled) is quickly full and causes some error on the nodes. </p>
  
  <p>As we use the EC2 slaves plugin, it will be useful to be able to specify a threshold for this space size in order to put the node "offline" when the threshold is reached.. The EC2 instance will then be destroyed and another "healthy" slave will be started if needed.</p>
  
  <p>Is it currently possible to achieve this in Jenkins ?</p>
  
  <p>Version : Jenkins ver. 2.89.1</p>
  
  <p>Thank you !</p>