On the Community User's page, it says that one of it's tasks is to
Randomly poke old unanswered questions every hour so they get some attention
But some of the questions I have seen have answers on them. I think that in this case, it means that if there are answers, then they have no upvotes, but I think this needs to be better clarified.
The wording could read as such
Randomly poke old questions with no upvoted answers every hour so they get some attention