MetricService.java

// Just a service class which will provide the instance of PrometheusMeterRegistry
public class MetricService {

  private static PrometheusMeterRegistry prometheusMeterRegistry = null;

  public static PrometheusMeterRegistry getRegistry() {
    if (prometheusMeterRegistry == null) {
      prometheusMeterRegistry = new PrometheusMeterRegistry(PrometheusConfig.DEFAULT);
    }
      return prometheusMeterRegistry;
  }
}