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
./OpenStackManager/includes/OpenStackNovaUser.php: $link = Linker::link( SpecialPage::getTitleFor( 'NovaKey' ), ./OpenStackManager/includes/OpenStackNovaUser.php: $out .= Linker::link( ./OpenStackManager/includes/SpecialNovaKey.php: return Linker::link(