Heartbeat - every minute each server basically sends message to the master server saying "I'm still alive" if the heartbeat isn't received for a few minutes then the server is either down or restarting P30/120/300/600 - average performance over the past # minutes - if this is high and showing in red then the server is overburdened and probably lagging S6/12/24 - number of server restarts in the past # hours - if this is high then the server is probably crashing repeatedly Everything else is pretty self explanatory