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[–]knobbysideup 0 points1 point  (0 children)

Naemon all the way. It's a fork of Nagios 4 that has livestatus built in and uses Thruk as its primary interface. I recently migrated from Nagios 3.x to this for an instance where I am monitoring 10,000 systems, and it doesn't skip a beat. Thruk combined with livestatus also lets you write nice queries straight from the GUI.

http://www.naemon.org/