Logs from Firewall NetScreen

[nbniel () gmail com]

Hello,
I'm wonder if someone knows what are the options of logs that should be activated in the syslogs of firewall netscreen, 
in my case, we have the next log settings:
- Emergency    -> Activated
- Alert        -> Activated
- Critical     -> Activated
- Error        -> Activated
- Warning      -> Deactivated
- Notification -> Deactivated
- Information  -> Deactivated
- Debugging    -> Deactivated

But i'do not know if they are the best practices, i would think to keep activated just Emergency, Alert, Critical and 
Notification but i'm not sure; or the other option is to activate all...
The problem with the last is that there's too much information that my SIEM received and don't know if every event is 
important to monitor...
I hope someone could help me...

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