title: Jenkins operational log
body: <p>We have a situation where something causes our Jenkins master to start leaking memory at a certain time each night. No jobs are running at this time, so I'm not interested in logs of build jobs.<br>
  We would like to figure out what is happening around this time, but we cannot see much in the jenkins.out.log, since it doesn't log a lot and lacks timestamps.</p>
  
  <p>Does anyone know if there is a way to turn on more detailed operational (not just errors) logging in Jenkins?</p>