@type t() :: %Milvex.Milvus.Proto.Msg.MsgPosition{
  WAL_name: Milvex.Milvus.Proto.Common.WALName.t(),
  __unknown_fields__: [Protobuf.unknown_field()],
  channel_name: String.t(),
  msgGroup: String.t(),
  msgID: binary(),
  timestamp: non_neg_integer()
}