We're running an ActiveMQ-based messaging infrastructure with multiple applications communicating over it. Everything is running fine, but we want to implement an 'alert'-system in case something goes wrong. I'm not talking about a broker failure here (that is already monitored), but of application-related (or even business-level) 'mishaps'.
Things we want to detect: * 'overfilling' of a queue because the consumer-application is either dead or simply cannot keep up with the message load. So basically we want to monitor the queue-length and raise an alert if it grows over a certain amount of messages. * messages on queues that're supposed to be empty in a perfect world (invalidMessage-queues, dead-letters). * no messages are sent to a queue (f.e. measured via the enqueue-count) I'm imagining some system that let's you input the assertions/policies and the action on violation (i.e. send an email, send a message to a queue) per queue and then monitors that. Now, while I'm sure it's possible to build such an application (maybe even as an ActiveMQ-plugin) I wanted to ask whether anybody known such a system (preferably open-source)? I think the requirement is common enough that an OS-solution could (should :) exist. If it does not and we decide to build it, would the ActiveMQ-project be interested in a donation or should be just host it somewhere else and maybe provide a link in the wiki? Mario
