带有普罗米修斯的Spring执行器，自定义MetricWriter从不调用

Question

根据示例，我应该实现自定义的MetricWriter来更新PrometheusCollectorRegistry中相应的Counter或Gauge。如下所示：

class PrometheusMetricWriter implements MetricWriter {

    CollectorRegistry registry

    private final ConcurrentMap<String, Gauge> counters = new ConcurrentHashMap<>()
    private final ConcurrentHashMap<String, Gauge> gauges = new ConcurrentHashMap<>()

    @Autowired
    PrometheusMetricWriter(CollectorRegistry registry) {
        this.registry = registry
    }

    @Override
    void increment(Delta<?> delta) {
        counter(delta.name).inc(delta.value.doubleValue())
    }

    @Override
    void reset(String metricName) {
        counter(metricName).clear()
    }

    @Override
    void set(Metric<?> value) {
        println "inside metric writer"
        gauge(value.name).set(value.value.doubleValue())
    }

    private Counter counter(String name) {
        def key = sanitizeName(name)
        counters.computeIfAbsent key, { k ->
            Counter.build().name(k).help(k).register(registry)
        }
    }

    private Gauge gauge(String name) {
        def key = sanitizeName(name)
        gauges.computeIfAbsent key, { k ->
            Gauge.build().name(k).help(k).register(registry)
        }
    }

    private String sanitizeName(String name) {
        return name.replaceAll("[^a-zA-Z0-9_]", "_")
    }
}

其他3个必需元素是:PrometheusEndpoint、PrometheusMvcEndpoint、PrometheusEndpointContextConfiguration。

毕竟，可以通过调用“http：//localhost:8080/prometheus”URL来查看收集到的指标。

# HELP gauge_com_egalacoral_spark_stage_vto gauge_com_egalacoral_spark_stage_vto
# TYPE gauge_com_egalacoral_spark_stage_vto gauge
gauge_com_egalacoral_spark_stage_vto 4.0
# HELP gauge_com_egalacoral_spark_test_vfl gauge_com_egalacoral_spark_test_vfl
# TYPE gauge_com_egalacoral_spark_test_vfl gauge
gauge_com_egalacoral_spark_test_vfl 16.0

class Runner {

    @Autowired
    GaugeService gaugeService

    private static final Logger logger = LoggerFactory.getLogger(Runner.class)

    private ZoneId zoneId = ZoneId.of('Europe/London')

    private Integer delay = 10

    @Scheduled(fixedDelay = 10000L)
    void runOnTest() throws Exception {

        def now = ZonedDateTime.now(zoneId)
        println "collect metrics"
        gaugeService.submit("test", 2.0)

    }
}

Answer 1

因此，我找到了GaugeService的DropWizardMetricServices实现使用的原因。

根据Spring文件：

50.10 Dropwizard度量