@Override
            public void onCompleted() {
                responseObserver.onNext(Commands.newBuilder().build());
                responseObserver.onCompleted();
            }
If this is not the first element of the streaming,
use the previous not-null name as the service name.
oap-server/server-receiver-plugin/skywalking-log-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/log/provider/handler/grpc/LogReportServiceGrpcHandler.java