title: systemd : how to get last n process status change
body: <p>Does systemd maintain process state change somewhere ? If so how can I get last n process state change </p>
  
  <p>Even if not all status can I get information corresponds to process restart . Information like when and why </p>
  
  <p>For example </p>
  
  <pre><code>$systemd-processBootHistory 
  process-name    boot-time   signal 
  process1         03mins        11
  </code></pre>