title: How can I check via a script or a plugin in Jenkins whether a slave is online before starting a build from another project on it
body: <p>Is there a way to detect in a certain job by example running on the master) to check if the slaves needed for the next buildsteps are online?</p>
  
  <p>I would want the master job to fail and don't start any next build if not all needed slave nodes are online.</p>