I don't believe those metrics are available.

I remember doing this by using grep/awk on the thread pool dump at regular intervals (searching for HornetQ active threads).

You can trigger a thread dump on the application server with:

jstack serverPID

As an alternative, you can issue a REST request to the hawtio console which needs to be deployed on the application server. I'm afraid either way you have to get your hands dirty on this if you want to capture these metrics.