@Override
            public void onError(final Throwable throwable) {
                log.error(throwable.getMessage(), throwable);
            }
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