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}
```
> Attempting to throw an exception from a destructor (called in the time of script termination) causes a fatal error. -- PHP Manual