title: Journalctl : add _SYSTEMD_UNIT field into log printout
body: <p>Using the command:</p>
  
  <blockquote>
    <p>/usr/bin/journalctl -o short -f | ncat {some-ip} {some port}</p>
  </blockquote>
  
  <p>To forward journal output to some remote log tracking app.</p>
  
  <p>Problem is that I'm missing the systemd unit / service name in the printout making it hard to tell which service produces what log line.</p>
  
  <p>for example this is a nginx line :</p>
  
  <blockquote>
    <p>Jun 25 07:51:09 localhost <strong>bash[497]</strong>: 10.23.132.98 - -
    [25/Jun/2014:07:51:09 +0000] "GET /page.html HTTP/1.1" 200 321
    "https://{ip}" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36
    (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36"</p>
  </blockquote>
  
  <p>In the log there is <strong>bash[497]</strong> - the PID of the process. How can I add more data to the log ? For example the docker container name of this PID or the systemd service/unit name ?</p>