@Override
    public void check(HealthCheckRequest request, StreamObserver<HealthCheckResponse> responseObserver) {
        final String service = firstNonNull(request.getService(), EMPTY_SERVICE);
        final ServingStatus status = checkServingStatus(service);
        if (status == ServingStatus.SERVICE_UNKNOWN) {
            responseObserver.onError(getNotFoundStatus(service));
            return;
        }
        responseObserver.onNext(getHealthCheckResponse(status));
        responseObserver.onCompleted();
    }
Returns a new builder which builds a new {@link GrpcHealthCheckService}.
grpc/src/main/java/com/linecorp/armeria/server/grpc/GrpcHealthCheckService.java