Rabbitmq-nagios is a project mainly written in Python, it's free.
Python-powered rabbitmq plugins for Nagios
Move plugins to you nagios plugins directory e.g. /var/lib/nagios/plugins/
Allow nagios to perform sudo commands without a password, be sure to lock it down to only the rabbitmq plugins
nagios ALL=(ALL) NOPASSWD:/usr/lib/nagios/plugins/check_rabbitmq_queue_length
command[check_rabbitmq_queue_length]=sudo /usr/lib/nagios/plugins/check_rabbitmq_queue_length -w 10000 -c 20000 -v /