read this:

http://darktalker.com/2011/load-balancer-nodejs-startupmonit/

More on deploy and Jake
http://blog.clock.co.uk/2011/04/11/deploying-node-js-apps/

check process plusnode
    with pidfile "/var/run/your_app.pid"
    start program = "/sbin/start your_app"
    stop program = "/sbin/stop your_app"
    if 2 restarts within 3 cycles then timeout
    if totalmem > 100 Mb then alert
    if children > 255 for 5 cycles then stop
    if cpu usage > 95% for 3 cycles then restart
    if failed port 80 protocol http
    request /valid_url/
    with timeout 5 seconds
    and if failed port 443 type tcpssl protocol http
        request /valid_url/
        with timeout 5 seconds
    then restart