What is the best server and network monitoring utility that can monitor CPU load, memory usage, disk I/O, network speed, latency, packet loss, etc., and report via email the moment something goes wrong?
May need to wait for their new alerting module for the latter part though.
+1 - Unfortunately they recently did go for a pricing model for future updates, however their existing code works great. For better alerting you'd need to pay $100 pounds / year (which is still extremely cheap)
Recommend nagios, basic and its very configurable.
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I agree with some of the other posters, Observium is great! Interface is neat and tidy.
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a) it is very simple to set up, 1/4 as long as Nagios
b) unlike Nagios, it is very easy to also get it to hit a web page, check for a string, and if not bounce apache/nginx . You can even monitor UDP services without too much difficulty