In other words: we rub our bellies and take a guess and then change the values if we get too many or too few alerts. We’re experienced sysadmins — how much time do you think we have? :-)
Who am I? I am Susan Ivanova. Commander. Daughter of Andrei and Sofie Ivanov. I am the right hand of vengeance and the boot that’s going to kick your sorry ass all the way back to Earth, sweetheart! I am death incarnate and the last living thing that you are ever going to see. God sent me!