@Override
            public void onCompleted() {
                responseObserver.onNext(Commands.newBuilder().build());
                responseObserver.onCompleted();
            }
Meter protocol receiver, collect and process the meters.
oap-server/server-receiver-plugin/skywalking-meter-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/meter/provider/handler/MeterServiceHandler.java