Add the following metrics about the pool of message exchange processors:
- max size,
- min size of idle objects,
- max number of concurrent borrowed message exchange processors,
- current number of concurrent borrowed message exchange processors,
- max number of idle message exchange processors,
- current number of idle message exchange processors,
- number of exhaustions of the message exchange processors pool.
A defect will be sent if the current number of concurrent borrowed message exchange processors reachs the max size of the pool (ie: no more message exchange processor is available)
Another defect will be sent when a exhaustion occurs.