Linker::link() and Linker::linkKnown() functions are deprecated as of MediaWiki 1.28, and the new LinkRenderer is preferred instead.
https://doc.wikimedia.org/mediawiki-core/master/php/classLinker.html
./ArticleFeedbackv5/includes/ArticleFeedbackv5Render.php: ->rawParams( $userName, Linker::linkKnown( $article ) )