In MismatchFinder, we're tracking how each Mismatch was resolved and are making those statistics available as a CSV-file. The new status that is being added as part of T323204, should appear in that file as well.
That CSV file can be downloaded at https://mismatch-finder.toolforge.org/store/imports:
It was added in context of T295759: review statistics for all imports
- the review statistics file has a new column for the new "Missing in Wikidata" status and reports the number of respective decisions in that column