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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(4, 'No free threads available for launching jobs', Array) (Line: 136)
Drupal\Core\Logger\LoggerChannel->log(4, 'No free threads available for launching jobs', Array) (Line: 86)
Drupal\Core\Logger\LoggerChannel->warning('No free threads available for launching jobs') (Line: 301)
Drupal\ultimate_cron\Plugin\ultimate_cron\Launcher\SerialLauncher->launchJobs(Array) (Line: 64)
Drupal\ultimate_cron\UltimateCron->run() (Line: 70)
Drupal\ultimate_cron\ProxyClass\UltimateCron->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: 671)
Drupal\Core\DrupalKernel->terminate(Object, Object) (Line: 22)