Nagios checking script that generates a warning or error if one or more nodes hasn't checked in with the master for a specified time. Works on 2.7
icli - Icinga Command Line Interface
This perl script can request an overnight, daily, weekly or monthly report from the Nagios server using the standard CGIs, it then parses the output (formats CSS for Web and Lotus Notes), then emails as an Inline HTML email to a supplied email address.