Looking at https://github.com/RMerl/asuswrt-merlin/wiki/Enhanced-Traffic-monitoring it says, Using RT-N66U, Firmware: 380.69. It is enabled, and it did make the file tomato_rstats_bcee7b930048.gz in the same directory as the bandwidth monitor (it does NOT allow a different directory!), however, there isn't 3 new entries to the traffic monitor page selector. Nothing has changed on that page. Under Traffic Manager -> Traffic monitor, it just shows bandwidth there. Nothing else. No IP listings or anything, and no new options, so, this seems like a bug?