As a Fortigate Administrator, what do you monitor?

[Dyop_Geop]

Hi fellow Engineers,

I dunno if this is a somewhat "common sense" question for you guys, but may I just ask, as fortigate admins, with experiences,  what do you usually monitor in the fortigate box? I know the necessary like cpu usage, memory, etc (system resources).

What else? what are the important stuff, as firewall admins, we (or I) should be checking every now and then?

Hope you guys would be able to give great responses. Thanks so much!