Spring AMS is actually a slightly modified version of Hyperic HQ EE.
HQ (both Community and Enterprise Editions) use Plugins to monitor a particular technology. Some of the plugins are actually contributed and maintained by the community (see http://www.hyperic.com/products/monitoring-plugin-resources.html). HQ does ship with an old plugin for Apache ActiveMQ 4.x that uses some criteria to identify a running AMQ 4.x broker. Those criteria also happen to match a AMQ 5.x broker as well. That and the fact that FUSE MB is based on ActiveMQ, makes plugin believe it's dealing with a AMQ 4.0 broker.
I did not test, but afaik there are no significant changes in the JMX naming conventions used by AMQ between 4.x and 5.x, so the old plugin should do a fairly decent job.
thanks for this useful information. I now understand why I always see ActiveMQ 4.0 even though I am using Fuse MQ 126.96.36.199.
But as you said the plugins come along with AMS, then why is my queue not showing any metric data. I get the name of my queue as well, but it says '0.0% Availability'. Is this because I am using the Evaluation Version of AMS?