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
./Poll/includes/Poll.php: $output->addHtml( Html::rawElement( 'li', [], Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-create-link' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Html::rawElement( 'li', [], Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-create-link' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Html::rawElement( 'li', [], Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-list-current' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Html::rawElement( 'li', [], Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-list-old' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), ./Poll/includes/Poll.php: $output->addHtml( Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), [], [ 'action' => 'list' ] ) ); ./Poll/includes/Poll.php: $output->addHtml( wfMessage( 'poll-administration' )->escaped() . ' ' . Linker::linkKnown( $this->getPageTitle(), ./Poll/includes/Poll.php: $tableRow[] = Linker::linkKnown( $this->getPageTitle(), htmlentities( $row->question, ENT_QUOTES, "UTF-8" ), [], ./Poll/includes/Poll.php: $tableRow[] = Linker::linkKnown( $this->getPageTitle(), htmlentities( $row->question, ENT_QUOTES, "UTF-8" ), [], ./Poll/includes/Poll.php: $tableRow[] = Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-title-score' )->escaped(), [], ./Poll/includes/Poll.php: $tableRows[] = [ Xml::submitButton( wfMessage( 'poll-submit' )->escaped() ) . ' ' . Linker::linkKnown( $this->getPageTitle(), ./Poll/includes/Poll.php: Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-back' )->escaped(), [], [ 'action' => 'list' ] ) ); ./Poll/includes/Poll.php: Linker::linkKnown( $this->getPageTitle(), wfMessage( 'poll-delete' )->escaped(), [],