Tuning zabbix: What is the number of proceesses deemed to be reasonable on a server

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http://serverfault.com – Yes, so I am getting to grips (and loving) zabbix, and have started the process of fine-tuning the alerts. I have this alert that is triggered on a linux server for having over 300 processes. Now, this is sort of a central server that acts as a firewall and runs a bunch of stuff.. namely proxy/httpd-server/mysql/open-vpn/zabbix Is there anything to look out for before I pop up the alert trigger to 350 processes? The cpu load is still relatively quite low, I was thinking maybe one would check other stuff before upping the alerts. Would I need to check if machine is bottle-necked elswh (HowTos)