On dude v2.0b2 this was working well. On dude v2.0b3, when adding simple links, dude is also adding blank interface entrys on the data source list. i.e: “@device_name rx” which returns zero.
This may happen cuz now on dude v2.0b3, the “graph bit rate” checkbox is checked by default. If you notice a entry with no interface, check your map if there are “simple” links with “graph bit rate” checked and uncheck it. Then it will be removed from the data source list. Not a problem at all, just a difference from older versions than v2.0b3.