Puppet users - Mar 2014 - Monitoring an apache/passenger puppetmaster setup?

How do you monitor your apache/passenger-fronted puppetmaster to find out when
it's down?

As backstory, we have a chaos monkey sort of cron job randomly kill-9'ing
random processes and monit checking services to make sure they stay up. (Sadly
the chaos monkey part probably won't make it into production.)

The puppet agent seems to exit with a 0 status in some circumstances where the
puppetmaster isn't working, therefore doing a test noop agent run
doesn't help. So far the only way I've figured out to check if my
puppetmaster service is purportedly functioning is:

[root@cwt1 ~]# cat /usr/local/sbin/monit-check-passenger 
#!/bin/bash
exit `curl -k -s https://localhost:8140 | grep '500 Internal Server
Error' | wc -l`

Unfortunately the above gives me one of these in my syslog each minute, which is
harmless yet still ugly:

Mar  5 10:21:42 cwt1 puppet-master[32167]: The environment must be purely
alphanumeric, not ''

I'm interested in a puppetmaster monitoring solution which doesn't give
me log oddities.

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