check process xl2tpd with pidfile /opt/xl2tpd/var/run/xl2tpd.pid
  start program = "/etc/init.d/xl2tpd start" 
  stop program  = "/etc/init.d/xl2tpd stop"
  if cpu > 70% for 2 cycles then alert
  if cpu > 85% for 5 cycles then restart
  if totalmem > 1024.0 MB for 5 cycles then restart
  if children > 256 then restart
  if 30 restarts within 50 cycles then timeout