06:29:13,866 PM [testsystem-pekko.actor.default-dispatcher-4] [INFO] Slf4jLogger - Slf4jLogger started
06:29:14,289 PM [testsystem-pekko.actor.default-dispatcher-5] [INFO] RepointableActorRef -  pekkoDeadLetter Message [java.lang.String] from Actor[pekko://testsystem/system/testActor-13#-461964294] to Actor[pekko://testsystem/user/pingpongactor#1069771430] was not delivered. [1] dead letters encountered. If this is not an expected behavior then Actor[pekko://testsystem/user/pingpongactor#1069771430] 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'.