What is the criteria for the "common problems" list in the Highlights tab?

Are the criteria for "common problems" topics marked unresolved that are not buried? I have a topic that's been an emerging issue over the past couple days with a lot of activity. It is unresolved, and one of the most common in terms of "me too's", but doesn't show in highlights. I'd like to feature/highlight common issues that are currently in progress that lots of customers need to know about. (as opposed to dated, dead-end, one-offs that have been marked "acknowledged" or "in progress" but haven't been active for weeks) Thanks in advance for any suggestions, and for clarification on the criteria currently being used for the common problems list.