当我使用千分尺的 PrometheusMeterRegistry 时,指标没有出现在普罗米修斯端点

Metrics not appearing at prometheus endpoint when I'm using micrometer's PrometheusMeterRegistry

我是 micrometer and prometheus 的新手,我正在尝试构建我的第一个 hello-world 应用程序,以使用 micrometer 和 prometheus 作为监控后端进行监控。但是我看不到我的应用程序(Counters 和 Timers)出现在普罗米修斯端点上的指标。

我正在观看 this tutorial for prometheus. I also followed this 千分尺入门视频。

我从 this link 下载了 prometheus,将其解压缩,然后 运行 prometheus 使用以下命令进行抓取:./prometheus --config.file=prometheus.yml。我在此配置文件中将目标设置为 targets: ['localhost:9090']

然后我 运行 我的 Main class 看起来像这样:

import cern.jet.random.Normal;
import cern.jet.random.engine.MersenneTwister64;
import cern.jet.random.engine.RandomEngine;
import io.micrometer.core.instrument.Counter;
import io.micrometer.core.instrument.Gauge;
import io.micrometer.core.instrument.Timer;
import io.micrometer.core.instrument.composite.CompositeMeterRegistry;
import io.micrometer.core.instrument.logging.LoggingMeterRegistry;
import io.micrometer.jmx.JmxMeterRegistry;
import io.micrometer.prometheus.PrometheusMeterRegistry;
import reactor.core.publisher.Flux;

import java.time.Duration;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

public class Main {

    public static void main(String[] args) throws InterruptedException {
        CompositeMeterRegistry compositeMeterRegistry = new CompositeMeterRegistry();

        LoggingMeterRegistry loggingMeterRegistry = SampleMeterRegistries.loggingMeterRegistry();
        JmxMeterRegistry jmxMeterRegistry = SampleMeterRegistries.jmxMeterRegistry();
//        AtlasMeterRegistry atlasMeterRegistry = SampleMeterRegistries.atlasMeterRegistry();
        PrometheusMeterRegistry prometheusMeterRegistry = SampleMeterRegistries.prometheus();

        compositeMeterRegistry.add(loggingMeterRegistry);
        compositeMeterRegistry.add(jmxMeterRegistry);
//        compositeMeterRegistry.add(atlasMeterRegistry);
        compositeMeterRegistry.add(prometheusMeterRegistry);


        AtomicInteger latencyForThisSecond = new AtomicInteger(0);
        Gauge gauge = Gauge.builder("my.guage", latencyForThisSecond, n -> n.get())
                .register(compositeMeterRegistry);

        Counter counter = Counter
                .builder("my.counter")
                .description("some description")
                .tags("dev", "performance")
                .register(compositeMeterRegistry);

        Timer timer = Timer.builder("timer")
                .publishPercentileHistogram()
                .sla(Duration.ofMillis(270))
                .register(compositeMeterRegistry);

        // colt/colt/1.2.0 is to be added for this.
        RandomEngine randomEngine = new MersenneTwister64(0);
        Normal incomingRequests = new Normal(0, 1, randomEngine);
        Normal duration = new Normal(250, 50, randomEngine);

        latencyForThisSecond.set(duration.nextInt());

        // For Flux you require io.projectreactor/reactor-core/3.2.3.RELEASE
        Flux.interval(Duration.ofSeconds(1))
                .doOnEach(d -> {
                    if (incomingRequests.nextDouble() + 0.4 > 0) {
                        timer.record(latencyForThisSecond.get(), TimeUnit.MILLISECONDS);
                    }
                }).blockLast();

    }
}

当我 运行 ./prometheus --config.file=prometheus.yml 时,我可以访问端点 http://localhost:9090/metrics 以及 http://localhost:9090/graph。但是当我尝试在 http://localhost:9090/graph sum(timer_duration_seconds_sum) / sum(timer_duration_seconds_count) 上执行查询时,它说 no datapoints found.

在我看来,我遗漏了一些明显的东西(因为我是这两个主题的初学者)。

有人可以指出我遗漏了什么吗?

我找不到(在我的 Main class 中的位置)我必须配置 URI 以便为 prometheus 发布。即使我发布到 http://localhost:9090(默认情况下可能被千分尺隐藏在某处)我也找不到它。

targets: ['localhost:9090']

那是普罗米修斯被要求抓取自己。

您需要为 Java 应用程序的 HTTP 端点添加一个目标。