I agree that domestication is a big term. It's more like a symbiotic relationship between the monkeys and the wolves. The article states that the monkeys are herbivores and thus not predators.
You are right, I'm mistaking it with the Hamadryas. Geladas are the interesting mountain monkeys that eat dry grasses.
It seems that solitary wolves enjoy protection from feral dogs within the group of monkeys surveying and thus can concentrate in the chase of rodents (and maybe use also placents and any dead monkey corpse?). Wolves probably understand that monkey bite will do a lot of damage and avoid to put himselves in troubles. Geladas eat a very poor diet, live in a cold place and (as pandas) probably need to preserve the energy so spend it chasing a much faster wolf is a bad movement. Common enemies. Not conflict of interests with diet, long lives and social animals that can remember you; thus: Not need to be unpolite. To start a fight is a lose:lose movement for both.
