cluster-metrics/src/main/scala/org/apache/pekko/cluster/metrics/protobuf/MessageSerializer.scala
distributed-data/src/main/scala/org/apache/pekko/cluster/ddata/protobuf/SerializationSupport.scala

cluster-metrics/src/main/protobuf/ClusterMetricsMessages.proto
distributed-data/src/main/protobuf/ReplicatedDataMessages.proto

cluster-metrics/src/main/protobuf/ClusterMetricsMessages.proto
distributed-data/src/main/protobuf/ReplicatorMessages.proto