On at least enwiki, there is a "page_broken" database table that appears to be unused and unneeded.
Its number of rows:
MariaDB [enwiki_p]> select count(*) from page_broken;
+----------+
count(*) |
+----------+
722233 |
+----------+
1 row in set (0.16 sec)
This database table should be dropped from all Wikimedia wikis.
Version: wmf-deployment
Severity: enhancement