check process apache2 with pidfile /var/run/apache2.pid
   start program = "/etc/init.d/apache2 start"
   stop program = "/etc/init.d/apache2 stop"

check process prober with pidfile /var/run/prober.pid
   start program = "/etc/init.d/prober start"
   stop program = "/etc/init.d/prober stop"