public static RpcRequest rpcRequest(MethodDescriptor<?, ?> method, String simpleMethodName) {
        // See below to learn why we use GrpcLogUtil.class here.
        return RpcRequest.of(GrpcLogUtil.class, method.getServiceName(), simpleMethodName, ImmutableList.of());
    }
Returns a {@link RpcRequest} corresponding to the given {@link MethodDescriptor}.
grpc/src/main/java/com/linecorp/armeria/internal/common/grpc/GrpcLogUtil.java