06:45:00,532 AM [testsystem-pekko.actor.default-dispatcher-6] [INFO] Slf4jLogger - Slf4jLogger started 06:45:01,45 AM [testsystem-pekko.actor.default-dispatcher-8] [INFO] RepointableActorRef - pekkoDeadLetter Message [java.lang.String] from Actor[pekko://testsystem/system/testActor-30#2002940978] to Actor[pekko://testsystem/user/pingpongactor#1301175520] was not delivered. [1] dead letters encountered. If this is not an expected behavior then Actor[pekko://testsystem/user/pingpongactor#1301175520] may have terminated unexpectedly. This logging can be turned off or adjusted with configuration settings 'pekko.log-dead-letters' and 'pekko.log-dead-letters-during-shutdown'. 06:45:01,51 AM [testsystem-pekko.actor.default-dispatcher-10] [INFO] CoordinatedShutdown - Running CoordinatedShutdown with reason [ActorSystemTerminateReason]