自定义直方图指标未显示在普罗米修斯中

Question

I am trying to add a merics in my plain java class in a spring app, like explained here

static final Histogram requestLatency = Histogram.build()
        .name("my_custom_service_method_latency_seconds")
        .help("Request latency in seconds for my_custom_service

.").register();

...and then in method:

Histogram.Timer requestTimer = requestLatency.startTimer();

try{
....

}finally{
    requestTimer.observeDuration();
}

But on prometheus dashboard I see no such metrics.

Am I missing something here?

Edit: In application.properties, I have:

management.endpoint.prometheus.enabled=true
management.metrics.export.prometheus.enabled=true
management.endpoint.health.show-details=always

Answer 1

Issue for me was using the default .register() method which is using the defaultRegisty :

public C register() {
  return register(CollectorRegistry.defaultRegistry);
}

Here is the code that worked for me (after injection of CollectorReqistry ):

              Histogram.build()
                  .name("requests_latency")
                  .help("Request latency in seconds.")
                  .buckets(50.0, 100.0, 150.0, 200.0, 250.0, 300.0)
                  .labelNames("my label")
                  .register(collectorRegistry);