Hello Jay -
Thank you for the reply.
I was not sure that was all I needed to do. I was just experimenting to see what it would take to enable those metrics. After I added those metrics in the deployment descriptor I saw that I could see and enable those metrics but when I look at them under monitoring the values are listed as NaN. I changed the schedules for some of them to 5 minutes to see if anything happens. I haven't seeing much so far but I am keeping an eye on them. 
As far as the alert definition goes I was using the Measurement Absolute Value Threshold.
I am suspecting that the issue is in regard t to the collection since they are showing up in the monitor as NaN. I started looking at the plugin code again and it seems to me that the code is there in the WebRuntime, similar to what was in the WebApplicationContext in the jboss-as-5-plugin.

Regards,

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Claudianus