title: Monitoring and alerting on activemq
body: <p>Hi with activemq problems that i usually face are as under:-
  1. Pushed message do not get consumed
  2. As a result of point 1, queue size becomes huge
  3. Messages in queue keep on retrying</p>
  
  <p>So is there any open source that anyone of you have used in project to send mails when queue size goes beyond a certain threshold. Can we also send message details or store it somewhere to diagnose later why these messages were not getting consumed. </p>