Last modified: 2013-05-07 17:10:40 UTC
Visiting https://en.wikipedia.org/w/api.php?action=query&meta=notifications gives me: <error code="internal_api_error_MWException" info="Exception Caught: Internal error in ApiFormatXml::recXmlPrint: (list, ...) has integer keys without _element value. Use ApiResult::setIndexedTagName()." xml:space="preserve" /> https://en.wikipedia.org/w/api.php?action=query&meta=notifications&format=jsonfm works just fine.
Related URL: https://gerrit.wikimedia.org/r/61998 (Gerrit Change I676f7e7fee1167d02ed35920719105d3ca260e74)