Parent task that aggregates all the known bugs and open questions around quality for the mediawiki_history data stream.
Should I add other mediawiki_history data quality issues as substasks here? For example, T218463.
We could use a place in Phab to track data quality issues in general, but perhaps this task was created with a very specific scope in mind. Perhaps Analytics-Data-Quality, if it's okay for us to mess with the workboard there?