Monitoring Server Health

[Jerlique Bahn]

Hello,

What are sys-admin's using to monitor the status and health of their freebsd
servers?

Specifically what I mean is the collection of data from the server such as
CPU Utilization, memory utilization, various networking resources (eg active
connections), disk health etc. 

I do not mean programs such as nagios which would manage/act on this data.

Your thoughts appreciated.

JB