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it supports a ton of sensors plus own triggers, error notification by mail and also shows nice graphs for people which prefer a graph over numbers :)
[edited by: bakedjake at 2:50 pm (utc) on April 8, 2009]
[edit reason] url drop [/edit]
Munin [munin.projects.linpro.no] -- very versatile.
Scout [scoutapp.com] -- very simple to get started with and configure.
Nagios [nagios.org] -- somewhat intimidating in its breadth, but very flexible.
All these use an open-source plugin model to monitor a variety of stats. My guess is that once you've got load averages logging working, there are other metrics you're going to want to see alongside it, like disk I/O CPU utilization.
[edited by: bakedjake at 5:51 pm (utc) on Aug. 5, 2009]
[edit reason] fixed url [/edit]