在 Spring Boot 和 Prometheus 中监控自定义指标

Question

I want to send some metrics, such as ResponseTime, RequestCount, etc. to Prometheus and then define a dashboard on Grafana. I know that I have to autowire PrometheusMeterRegistry in our class and use that as shown in the following:

@Autowired
private PrometheusMeterRegistry registry;

public void addSuccess(){
    registry.counter("RequestCountMetric", "success").increment()
}

Now, I don't know how to set up the Prometheus ip/port in our Spring Boot application.

Answer 1

Prometheus uses a pull/scrape model meaning that instead of that the Spring Boot application sends metrics to a monitoring system, eg over and UDP utilizing statsD, Prometheus will call an endpoint exposes by the application to pull the metrics.

Add prometheus to your exposed actuator endpoints in your application.properties in order to open up the endpoint /actuator/prometheus :

management.endpoints.web.exposure.include=prometheus

So, you actually need to configure your Prometheus instance where it can find the Spring Boot application.

Here is an example of the Prometheus config pointing to a local Spring Boot application:

global:
  scrape_interval:     15s
  evaluation_interval: 15s

  - job_name: 'my-application to scrape'
    metrics_path: '/actuator/prometheus'
    scrape_interval: 5s
    static_configs:
      - targets: ['localhost:8080']

Last step is to point your Grafana to your Prometheus which can easily be done in the Grafana UI and add the Prometheus datasource.