Support monitoring of ActiveMQ

We decided to raisethis feature request to address our need for monitoring Apache ActiveMQ.

We are hoping to monitoring the following metrics for each topic and queue running on server.

1. Enqueue Count

2 .Dequeue Count

3. Expired Count

4. Producer Count

5. Consumer Count

6. Queue Size

7. Memory Percent Usage

ActiveMq doesn't talk to SNMP agent, so this is a little bit challenging. The guidance for monitoring provided by ActiveMq can be found at https://activemq.apache.org/how-can-i-monitor-activemq.