Found this in logstash while checking if T86385 is fixed:
SlowTimer [27533ms] at runtime/ext_mysql: slow query: SELECT /* DatabaseMessageIndex::get 176.31.2.171 */ tmi_value FROM translate_messageindex WHERE tmi_key = '-1:userLogin' LIMIT 1
MessageIndex should bail out early for namespaces that are not in $wgTranslateMessageNamespaces.
Stacktrace:
Expectation (readQueryTime <= 5) by MediaWiki::main not met (actual: 27.534023046494): query: SELECT tmi_value FROM `translate_messageindex` WHERE tmi_key = 'X' LIMIT N [TRX#cda9e2a3d3b2] TransactionProfiler.php line 311 calls wfBacktrace() TransactionProfiler.php line 204 calls TransactionProfiler->reportExpectationViolated() Database.php line 1006 calls TransactionProfiler->recordQueryCompletion() Database.php line 1572 calls DatabaseBase->query() Database.php line 1239 calls DatabaseBase->select() MessageIndex.php line 426 calls DatabaseBase->selectField() MessageIndex.php line 58 calls DatabaseMessageIndex->get() MessageHandle.php line 59 calls MessageIndex::getGroupIds() MessageHandle.php line 79 calls MessageHandle->figureMessage() TranslatablePage.php line 801 calls MessageHandle->getKey() PageTranslationHooks.php line 44 calls TranslatablePage::isTranslationPage() Hooks.php line 204 calls PageTranslationHooks::renderTagPage() Parser.php line 438 calls Hooks::run() MessageCache.php line 1078 calls Parser->parse() Message.php line 1110 calls MessageCache->parse() Message.php line 792 calls Message->parseText() Message.php line 848 calls Message->toString() SpecialUserlogin.php line 1504 calls Message->parse() SpecialUserlogin.php line 350 calls LoginForm->mainLoginForm() SpecialPage.php line 384 calls LoginForm->execute() SpecialPageFactory.php line 553 calls SpecialPage->run() MediaWiki.php line 280 calls SpecialPageFactory::executePath() MediaWiki.php line 704 calls MediaWiki->performRequest() MediaWiki.php line 506 calls MediaWiki->main() index.php line 41 calls MediaWiki->run() index.php line 3 calls include()