I have been a nagios user for a long time.
Of late, as the size of our server fleet grew, so did the number of alerts from nagios. Signal-to-noise ratio has become very low. eg. When a common service fails - all my load-balanced web-server which use that service & hence check for it start alerting. That mixed with system alerts possible from that service appearing in different order lead to a lot of noise.
I can spend a lot of time & ensure my nagios configurations are good, but it is increasingly becoming unmanageable. I am looking for a tool (or nagios plugin) that does de-duplication & intelligent suppression of alerts. Also, I would want "issues"/outages to be tracked in a trouble ticketing system - so that there is 1 place for anyone to get a good handle of whats happening with an issue. And also look at the archive.
Yes, I can do it to some extent in Nagios - but its not great.
While looking I found tons of tools ( http://www.slac.stanford.edu/xorg/nmtf/nmtf-tools.html#public ) but nobody seems to be talking of issues like de-duplication, issue tracking & management