We need some sort of statistics for the backlogs of review
CodeReview had some basic stats, that gave these sorts of numbers [1]
The simplest useful statistic would be number of unmerged (and not abandoned) revisions per git repository
[1] https://www.mediawiki.org/wiki/Special:Code/MediaWiki/stats
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=53485