https://pekko.apache.org/japi/pekko/snapshot/org/apache/pekko/cluster/sharding/typed/delivery/internal/ShardingProducerControllerImpl.UnsealedInternalCommand.html
ShardingProducerControllerImpl.UnsealedInternalCommand
declaration: package: org.apache.pekko.cluster.sharding.typed.delivery.internal, class: ShardingProducerControllerImpl, interface: UnsealedInternalCommand