RHMI Customer feature req.

Need to expose Saturation related metrics covering:
1) number of active AMQP connections ( both for all the producers and consumers)
2) number of stored messages in the queue
3) number of messages being severed the qdrouter network. So that we know that we need to increase the capacity
4) number of open links( in the amqp context)
5) disk usage has reached to certain limit