java – 千分尺/普罗米修斯如何保持仪表值不变为NaN？

我正在尝试监控登录用户,我通过调用api获取登录的用户信息,这是我使用过的代码,

public class MonitorService {
    private InfoCollectionService infoService;
    public MonitorService(InfoCollectionService infoService) {
        this.infoService = infoService
    }

    @Scheduled(fixedDelay = 5000)
    public void currentLoggedInUserMonitor() {
        infoService.getLoggedInUser("channel").forEach(channel -> {
            Metrics.gauge("LoggedInUsers.Inchannel_" + channel.getchannelName(), channel.getgetLoggedInUser());
        });
    }
}

我看到Prometheus中的值,问题是几秒后,值变为NaN,我已经读过Micrometer仪表用WeakReference(因此收集垃圾)包装它们的obj输入.我不知道如何解决它.如果有人知道如何解决这个问题,那就太好了.

解决方法:

这是Micrometer的一个缺点,我想最终解决.

您需要在此期间将值保留在映射中,以避免垃圾回收.注意我们如何将测量仪指向地图,并使用lambda来拉出值以避免垃圾收集.

public class MonitorService {
    private Map<String, Integer> gaugeCache = new HashMap<>();
    private InfoCollectionService infoService;
    public MonitorService(InfoCollectionService infoService) {
        this.infoService = infoService
    }

    @Scheduled(fixedDelay = 5000)
    public void currentLoggedInUserMonitor() {
        infoService.getLoggedInUser("channel").forEach(channel -> {
            gaugeCache.put(channel.getchannelName(), channel.getgetLoggedInUser());
            Metrics.gauge("LoggedInUsers.Inchannel_" + channel.getchannelName(), gaugeCache, g -> g.get(channel.getchannelName()));
        });
    }
}

我还建议为各种渠道使用标签：

Metrics.gauge("loggedInUsers.inChannel", Tag.of("channel",channel.getchannelName()), gaugeCache, g -> g.get(channel.getchannelName()));

标签：prometheus,java,spring-boot,micrometer
来源： https://codeday.me/bug/20190910/1800412.html