I have noticed that many monitors have the Generate alerts for this monitor checkbox checked, but then also have an override to set Enable Alerting to False (such as the Backup Status Monitor -- I definately want to know/get alerted if the Site Backup fails...)
So I am having to not only verify what monitors are enabled, but that they effectively still have alerting enabled for them...
Just wanted to point this out, as the MP Guide does not mention which monitors have alerting disabled...