Have only rolled out 1.31.0-wmf.29 to testwiki and already seeing this message at the top of logstash.
Stack trace:
#0 /srv/mediawiki/php-1.31.0-wmf.29/includes/libs/rdbms/database/Database.php(924): Wikimedia\Rdbms\Database->commit() #1 /srv/mediawiki/php-1.31.0-wmf.29/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1208): Wikimedia\Rdbms\Database->close() #2 (): Closure$Wikimedia\Rdbms\LoadBalancer::closeAll() #3 /srv/mediawiki/php-1.31.0-wmf.29/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1631): call_user_func_array() #4 /srv/mediawiki/php-1.31.0-wmf.29/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1209): Wikimedia\Rdbms\LoadBalancer->forEachOpenConnection() #5 /srv/mediawiki/php-1.31.0-wmf.29/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1199): Wikimedia\Rdbms\LoadBalancer->closeAll() #6 (): Wikimedia\Rdbms\LoadBalancer->disable() #7 /srv/mediawiki/php-1.31.0-wmf.29/includes/libs/rdbms/lbfactory/LBFactory.php(196): call_user_func_array() #8 (): Closure$Wikimedia\Rdbms\LBFactory::forEachLBCallMethod() #9 /srv/mediawiki/php-1.31.0-wmf.29/includes/libs/rdbms/lbfactory/LBFactoryMulti.php(425): call_user_func_array() #10 /srv/mediawiki/php-1.31.0-wmf.29/includes/libs/rdbms/lbfactory/LBFactory.php(199): Wikimedia\Rdbms\LBFactoryMulti->forEachLB() #11 /srv/mediawiki/php-1.31.0-wmf.29/includes/libs/rdbms/lbfactory/LBFactory.php(143): Wikimedia\Rdbms\LBFactory->forEachLBCallMethod() #12 /srv/mediawiki/php-1.31.0-wmf.29/includes/libs/rdbms/lbfactory/LBFactory.php(607): Wikimedia\Rdbms\LBFactory->destroy() #13 (): Wikimedia\Rdbms\LBFactory->__destruct() #14 {main}