A bunch of:
Use of ArchivedFile::userCan without passing a $user parameter was deprecated in MediaWiki 1.35. [Called from UploadBase::checkAgainstArchiveDupes in /srv/mediawiki/php-1.35.0-wmf.28/includes/upload/UploadBase.php at line 876]
logs are seen in production. Probably hard-deprecated a bit too quickly in https://gerrit.wikimedia.org/r/c/mediawiki/core/+/580144