title: In jenkins how can I see last time build ran, by his xml file?
body: <p>I Have more than 1000 jobs in Jenkins,
  And I would like to go through all of them in order to clean unused jobs.
  What is the recommended way to do so?</p>
  
  <p>I guess in every job "xml" file there is an indication to when it last ran,
  Can anyone point me where this file is located?</p>