<br />
<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_58055hbstnl797ph9pg6eqro5m, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
<br />
<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
!7

// works with certain versions of vnstat. Try apt-get install vnstat

module EstimatedMonthlyTraffic > DynBigNumber {
  switchable S vnstatInterface; // set this to the interface name if output is empty otherwise 
  
  start {
    dm_reloadOnFieldChange vnstatInterface();
    doEvery(0.0, 10*60.0, r {
      if (!isOnPATH('vnstat))
        setValue("vnstat not installed");
      else
        setValue(regexpReplaceWithNothing(",\\d+",
          parse_vnstat(backtick("vnstat" + (empty(vnstatInterface) ? "" : " -i " + vnstatInterface))).thisMonthEstimated));
    });
  }
}