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Spring-Boot-Prometheus makes it easy to use Prometheus with Spring Boot. It exposes an /prometheus endpoint with prometheus-compatible metrics just by adding @EnablePrometheusEndpoint to your configuration.

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package de.marcoaust.prometheus;

import java.util.*;

import org.springframework.boot.actuate.endpoint.PublicMetrics;
import org.springframework.boot.actuate.metrics.Metric;

import io.prometheus.client.Collector;


class SpringBootMetricsCollector extends Collector {
  private final Collection publicMetrics;

  SpringBootMetricsCollector(Collection publicMetrics) {
    this.publicMetrics = publicMetrics;
  }

  @Override
  public List collect() {
    Map samples = new HashMap();
    for (PublicMetrics publicMetrics : this.publicMetrics) {
      for (Metric metric : publicMetrics.metrics()) {
        String name = Collector.sanitizeMetricName(metric.getName());
        double value = metric.getValue().doubleValue();
        MetricFamilySamples metricFamilySamples = new MetricFamilySamples(
                name, Type.GAUGE, name, Collections.singletonList(new MetricFamilySamples.Sample(
                    name, Collections.emptyList(), Collections.emptyList(), value)));
        samples.put(name, metricFamilySamples);
      }
    }
    return new ArrayList(samples.values());
  }
}