Grafana Alert Mails

Hi, May I know on which panel we could get emails for the bulk of servers for following issues:

Server is rebooted
Server went to bad state(RAM 100% usage)
Disk, CPU usage to its maximum potential.

This question is very general and vague. What have you tried so far?

So far I have tried using graph and status panel.

Oh, I think I understand a bit better. Alerts are only in the Graph panels for now.

Yes, But in graph panel, we are unable to get the mail when ever server goes to bad state or if any of the server rebooted.

Yes. But for the for above mentioned cases it is not working. Can you please help us. Thanks!