Dead letters: akka.persistence.Delete{Messages,Snapshots}Success

2022-04-24T06:07:43,213 | INFO  | opendaylight-cluster-data-shard-dispatcher-33 | Shard                            | 289 - org.opendaylight.controller.sal-clustering-commons - 5.0.2 | member-1-shard-default-config: SaveSnapshotSuccess received for snapshot, sequenceNr: 40000
2022-04-24T06:07:43,221 | INFO  | opendaylight-cluster-data-akka.actor.default-dispatcher-18 | LocalActorRef                    | 284 - org.opendaylight.controller.repackaged-akka - 5.0.2 | Message [akka.persistence.DeleteSnapshotsSuccess] from Actor[akka://opendaylight-cluster-data/system/akka.persistence.snapshot-store.local#1209624202] to Actor[akka://opendaylight-cluster-data/user/shardmanager-config/member-1-shard-default-config#-1130914476] was unhandled. [1] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
2022-04-24T06:07:43,221 | INFO  | opendaylight-cluster-data-akka.actor.default-dispatcher-18 | LocalActorRef                    | 284 - org.opendaylight.controller.repackaged-akka - 5.0.2 | Message [akka.persistence.DeleteMessagesSuccess] from Actor[akka://opendaylight-cluster-data/system/akka.persistence.journal.segmented-file#1159426290] to Actor[akka://opendaylight-cluster-data/user/shardmanager-config/member-1-shard-default-config#-1130914476] was unhandled. [2] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
2022-04-24T06:08:36,956 | INFO  | opendaylight-cluster-data-shard-dispatcher-33 | Shard                            | 289 - org.opendaylight.controller.sal-clustering-commons - 5.0.2 | member-1-shard-default-config: Initiating snapshot capture CaptureSnapshot [lastAppliedIndex=39999, lastAppliedTerm=1, lastIndex=39999, lastTerm=1, installSnapshotInitiated=, replicatedToAllIndex=-1, replicatedToAllTerm=-1, unAppliedEntries size=0, mandatoryTrim=false]
2022-04-24T06:08:36,957 | INFO  | opendaylight-cluster-data-shard-dispatcher-30 | Shard                            | 289 - org.opendaylight.controller.sal-clustering-commons - 5.0.2 | member-1-shard-default-config: Persisting of snapshot done: Snapshot [lastIndex=39999, lastTerm=1, lastAppliedIndex=39999, lastAppliedTerm=1, unAppliedEntries size=0, state=org.opendaylight.controller.cluster.datastore.persisted.ShardSnapshotState@1e31ab3f, electionTerm=1, electionVotedFor=member-1-shard-default-config, ServerConfigPayload=null]
2022-04-24T06:08:36,957 | INFO  | opendaylight-cluster-data-shard-dispatcher-30 | Shard                            | 289 - org.opendaylight.controller.sal-clustering-commons - 5.0.2 | member-1-shard-default-config: Removed in-memory snapshotted entries, adjusted snaphsotIndex: 39997 and term: 1
2022-04-24T06:08:38,044 | INFO  | opendaylight-cluster-data-shard-dispatcher-30 | Shard                            | 289 - org.opendaylight.controller.sal-clustering-commons - 5.0.2 | member-1-shard-default-config: SaveSnapshotSuccess received for snapshot, sequenceNr: 80000
2022-04-24T06:08:38,048 | INFO  | opendaylight-cluster-data-akka.actor.default-dispatcher-14 | LocalActorRef                    | 284 - org.opendaylight.controller.repackaged-akka - 5.0.2 | Message [akka.persistence.DeleteMessagesSuccess] from Actor[akka://opendaylight-cluster-data/system/akka.persistence.journal.segmented-file#1159426290] to Actor[akka://opendaylight-cluster-data/user/shardmanager-config/member-1-shard-default-config#-1130914476] was unhandled. [3] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
2022-04-24T06:08:38,048 | INFO  | opendaylight-cluster-data-akka.actor.default-dispatcher-14 | LocalActorRef                    | 284 - org.opendaylight.controller.repackaged-akka - 5.0.2 | Message [akka.persistence.DeleteSnapshotsSuccess] from Actor[akka://opendaylight-cluster-data/system/akka.persistence.snapshot-store.local#1209624202] to Actor[akka://opendaylight-cluster-data/user/shardmanager-config/member-1-shard-default-config#-1130914476] was unhandled. [4] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.