Translation debugger with
URL does not seem to be a formally documented in Mediawiki Content Tranlation page
I came to know about it only through Phabricator when I encounted problem with Content Translation tool and reported it.
I found this tool highly useful to get the statistics of machine translation statistics and also to improve the translated pages.
This needs to be a formal feature of Content Translation with inputs as arguments on the URL and also documented on Mediawiki Content Translation pages.