anchor.diff:  In this example, we provide an object that implements the logic of the metric, in the case of a gauge,
   it needs to implement `org.eclipse.microprofile.metrics.Gauge`. Example:
   
  -[source%nowrap.java]
  +[source%nowrap,java]
   ----
   public class ActiveCountGauge implements Gauge<Long> {
   
  
positive.code: The recommended way to implement this check would be to produce a specific `SystemPropertyBuildItem` during build, which will make it easy
  to evaluate these two conditions, and then check back to this system property at runtime. Example:
  
  ----
  @BuildStep
  SystemPropertyBuildItem produceMetricsEnabledProperty(AgroalBuildTimeConfig extensionSpecificConfig,
  
negative.code: 
  An example build step for build-time registration of metrics:
  
  [source%nowrap,java]
  ----
  @BuildStep
  void registerMetrics(BuildProducer<MetricBuildItem> metrics) {
  