This was more the thrust of the question. It's not used on many bugs I've seen in Moodle, or commonly talked about in the community so I don't know how to read or use it in context of the tracker. It's fine to say it's an agile measure. But to go with that it's important to describe how it fits into the process.
For example 'assigned to' is clear what it is, but the use of it has changed recently with Unassigned being used rather than moodle.com for items not being worked on. I'm trying to suggest that the specific use process is as important to know as the objective item itself.