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PDOException: SQLSTATE[HY000] [2002] Connection refused in Drupal\dblog\Logger\DbLog->log() (line 101 of core/modules/dblog/src/Logger/DbLog.php). 
Drupal\dblog\Logger\DbLog->log(3, '%type: @message in %function (line %line of %file).', Array) (Line: 127)
Drupal\Core\Logger\LoggerChannel->log(3, '%type: @message in %function (line %line of %file).', Array) (Line: 447)
watchdog_exception('cron', Object) (Line: 239)
Drupal\Core\Cron->invokeCronHandlers() (Line: 134)
Drupal\Core\Cron->run() (Line: 75)
Drupal\Core\ProxyClass\Cron->run() (Line: 65)
Drupal\automated_cron\EventSubscriber\AutomatedCron->onTerminate(Object, 'kernel.terminate', Object)
call_user_func(Array, Object, 'kernel.terminate', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.terminate', Object) (Line: 88)
Symfony\Component\HttpKernel\HttpKernel->terminate(Object, Object) (Line: 32)
Stack\StackedHttpKernel->terminate(Object, Object) (Line: 686)
Drupal\Core\DrupalKernel->terminate(Object, Object) (Line: 22)

Uncaught exception thrown in shutdown function.

Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: DELETE FROM {semaphore} WHERE value = :db_condition_placeholder_0; Array ( [:db_condition_placeholder_0] => 20540261526ae1f7efe7b457.01045144 ) in _drupal_shutdown_function() (line 1074 of /home/webel02/public_html/drupal8/wca8/web/core/includes/bootstrap.inc). 

_drupal_shutdown_function()