Version: 1.30
PHP: 5.6
After the upgrade to 1.30, I've started to see this error in the php error log.
(Not sure in which project bugs related to core go)
```
[16-Dec-2017 06:19:09 UTC] PHP Warning: Using deprecated fallback handling for comment rc_comment [Called from CommentStore::getCommentInternal in /srv/mediawiki/w/includes/CommentStore.php at line 226] in /srv/mediawiki/w/includes/debug/MWDebug.php on line 309
2017-12-16 06:19:09 mw1 cpiwiki: [77acb3e05b58559a4509bdde] /wiki/Main_Page ErrorException from line 309 of /srv/mediawiki/w/includes/debug/MWDebug.php: PHP Warning: Using deprecated fallback handling for comment rc_comment [Called from CommentStore::getCommentInternal in /srv/mediawiki/w/includes/CommentStore.php at line 226]
#0 [internal function]: MWExceptionHandler::handleError(integer, string, string, integer, array)
#1 /srv/mediawiki/w/includes/debug/MWDebug.php(309): trigger_error(string, integer)
#2 /srv/mediawiki/w/includes/debug/MWDebug.php(164): MWDebug::sendMessage(string, array, string, integer)
#3 /srv/mediawiki/w/includes/GlobalFunctions.php(1205): MWDebug::warning(string, integer, integer, string)
#4 /srv/mediawiki/w/includes/CommentStore.php(226): wfLogWarning(string)
#5 /srv/mediawiki/w/includes/CommentStore.php(360): CommentStore->getCommentInternal(Wikimedia\Rdbms\DatabaseMysqli, stdClass, boolean)
#6 /srv/mediawiki/w/includes/changes/RecentChange.php(955): CommentStore->getCommentLegacy(Wikimedia\Rdbms\DatabaseMysqli, stdClass, boolean)
#7 /srv/mediawiki/w/includes/changes/RecentChange.php(121): RecentChange->loadFromRow(stdClass)
#8 /srv/mediawiki/w/extensions/News/NewsRenderer.php(474): RecentChange::newFromRow(stdClass)
#9 /srv/mediawiki/w/extensions/News/NewsRenderer.php(323): NewsRenderer->renderRow(stdClass)
#10 /srv/mediawiki/w/extensions/News/News.php(55): NewsRenderer->renderNews()
#11 [internal function]: wfNewsTag(string, array, Parser, PPTemplateFrame_DOM)
#12 /srv/mediawiki/w/includes/parser/Parser.php(3852): call_user_func_array(string, array)
#13 /srv/mediawiki/w/includes/parser/Preprocessor_DOM.php(1314): Parser->extensionSubstitution(array, PPTemplateFrame_DOM)
#14 /srv/mediawiki/w/includes/parser/Preprocessor_DOM.php(1680): PPFrame_DOM->expand(PPNode_DOM, integer)
#15 /srv/mediawiki/w/includes/parser/Parser.php(3259): PPTemplateFrame_DOM->cachedExpand(string, PPNode_DOM)
#16 /srv/mediawiki/w/includes/parser/Preprocessor_DOM.php(1229): Parser->braceSubstitution(array, PPFrame_DOM)
#17 /srv/mediawiki/w/includes/parser/Parser.php(2921): PPFrame_DOM->expand(PPNode_DOM, integer)
#18 /srv/mediawiki/w/includes/parser/Parser.php(1277): Parser->replaceVariables(string)
#19 /srv/mediawiki/w/includes/parser/Parser.php(451): Parser->internalParse(string)
#20 /srv/mediawiki/w/includes/content/WikitextContent.php(329): Parser->parse(string, Title, ParserOptions, boolean, boolean, integer)
#21 /srv/mediawiki/w/includes/content/AbstractContent.php(516): WikitextContent->fillParserOutput(Title, integer, ParserOptions, boolean, ParserOutput)
#22 /srv/mediawiki/w/includes/poolcounter/PoolWorkArticleView.php(145): AbstractContent->getParserOutput(Title, integer, ParserOptions)
#23 /srv/mediawiki/w/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#24 /srv/mediawiki/w/includes/page/Article.php(585): PoolCounterWork->execute()
#25 /srv/mediawiki/w/includes/actions/ViewAction.php(68): Article->view()
#26 /srv/mediawiki/w/includes/MediaWiki.php(499): ViewAction->show()
#27 /srv/mediawiki/w/includes/MediaWiki.php(293): MediaWiki->performAction(Article, Title)
#28 /srv/mediawiki/w/includes/MediaWiki.php(851): MediaWiki->performRequest()
#29 /srv/mediawiki/w/includes/MediaWiki.php(523): MediaWiki->main()
#30 /srv/mediawiki/w/index.php(43): MediaWiki->run()
#31 {main}
```