Yep, it's GMB per queue. You would have to enable qos watch-queue on the interface you want to monitor. As of ver 15.04.000015 it was limited to 1 interface being monitored. Also, in this version it only shows drops per queue, but does not show marked, dropped, queued, etc, like Catalyst switches. I know the A series switches do show most of these stats similar to Cisco switches. Hopefully in later versions this has been enhanced on the E series. You should give the command references a check.