Munin

From Freephile Wiki
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Munin is a network monitoring system that will provide visual graphs which aid you in seeing resource utilization in your infrastructure.

They are redoing their docs, and the "Munin Guide" is the new stuff http://guide.munin-monitoring.org/en/latest/installation/configuration.html

See Also

Many are based on RRDTool and/or the original wp:Nagios