How to configure sending Dropwizard metrics to Prometheus?

Question

I am calculating dropwizard metrics and I am using the "meter" metric of DW to calculate how many number of times in a second a particular API was hit. and I want to send this "rate metrics" calculated by DW to Prometheus.

I know DW stores these metrics values in java heap memory. How do I send them to Prometheus? Also, I do not want to make use of the "Pushgateway" since it isn't a batch job.

Answer 1

import io.micrometer.core.instrument.* 

/**
 * Avoid weak reference recycling
 */
private final static AtomicLong ALONG = new AtomicLong(0);

public void execute(ShardingContext shardingContext) {
  Gauge.builder("gaugeName",
    ALONG, (t) -> {
      // ... ... get result
      return 1;
    }).register(Metrics.globalRegistry);
}