I'm using nagios for monitoring and nagiosgraph for charting. I would like to issue an alert based on history (for example if the measurement value changed since last reading).
I've read that it is not wise to store historical information in a plugin, probably because of the possible scheduling issues. So what is the best way to implement such measurements?
I've got a nagios server setup for monitoring ~ 30 Windows servers. I want to add some trending charts. I've read that nagios graphing plugins are simple and many people use seperate, standalone charting/trending tools.
What are the restrictions of the nagios graphing plugins vs standalone products like ganglia/munin/cacti?
I'm interested in specific features and advantages that standalone packages offer and nagios graphing plugins don't.