I've got a nagios box that I setup years ago, and now that there are going to be some substantial platform changes I need to revisit the configuration. Unfortunately what I see there is not a sensible hierarchy of monitors and alerts, but a morass of services, hostgroups, servicegroups and other obscure nagios-language directives.
I haven't got a good reason to try and swap another some other network monitoring tool, so it looks like I am going to have to spend a few hours re-grokking the documentation for nagios (which has upped a version to 3.2.x since I last looked)
Here goes...