OpenGuardian is apparently the name of a commercial product.
http://hostguardian.com/index.php?url_channel_id=3&url_publish_channel_id=6&url_subchannel_id=&well_id=2
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OpenGuardian:
OpenGuardian allows you to take monitoring to the next level. Point OpenGuardian to any CGI script that reports a value, and OpenGuardian will check that value against thresholds that you configure in the toolset. You can specify either a minimum value, maximum value, or both. This allows you to monitor anything. Mail queues, hard drive usage, CPU utiliziation. The possibilities are endless.
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Ulric