It should be Debug level.
https://github.com/alibaba/dubbo/blob/23084275bf695f41b5f84d927c351e9b2b04a2be/dubbo-monitor/dubbo-monitor-default/src/main/java/com/alibaba/dubbo/monitor/dubbo/DubboMonitor.java#L77
private final Invoker<MonitorService> monitorInvoker;
    private final MonitorService monitorService;
    private final long monitorInterval;
    private final ConcurrentMap<Statistics, AtomicReference<long[]>> statisticsMap = new ConcurrentHashMap<Statistics, AtomicReference<long[]>>();
    public DubboMonitor(Invoker<MonitorService> monitorInvoker, MonitorService monitorService) {
        this.monitorInvoker = monitorInvoker;
        this.monitorService = monitorService;
        this.monitorInterval = monitorInvoker.getUrl().getPositiveParameter("interval", 60000);
        
        sendFuture = scheduledExecutorService.scheduleWithFixedDelay(new Runnable() {
            @Override
            public void run() {
                
                try {
                    send();
                } catch (Throwable t) {
                    logger.error("Unexpected error occur at send statistic, cause: " + t.getMessage(), t);
                }
            }
        }, monitorInterval, monitorInterval, TimeUnit.MILLISECONDS);
    }
    public void send() {
        if (logger.isInfoEnabled()) {
            logger.info("Send statistics to monitor " + getUrl());
        }
        String timestamp = String.valueOf(System.currentTimeMillis());
        for (Map.Entry<Statistics, AtomicReference<long[]>> entry : statisticsMap.entrySet()) {
            
            Statistics statistics = entry.getKey();
            AtomicReference<long[]> reference = entry.getValue();