@Override
            public void onCompleted() {
                responseObserver.onNext(Empty.newBuilder().build());
                responseObserver.onCompleted();
            }
gRPC handler of {@link RemoteServiceGrpc}. Continue the distributed aggregation at the current OAP node.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/remote/RemoteServiceHandler.java