A quest called "Chen's Empty Keg" is shown 7 or 8 times at random spots in The Barrens. I haven't visited all spots, but the 4 I have, no quests are available there.
Screenshots
Questie version
v.5.7.1
BreakBB commented
The quest is started by an object (the keg) which has multiple possible spawns in The Barrens. We show some (maybe all) of those possible spawns so users can keep an eye out when they roam the area.