[DropwizardExport] Apply label mapper to metric name for snapshots

Signed-off-by: Kacper Filutowski <[email protected]>

Author: KacperFilutowski-TomTom

prometheus-metrics-instrumentation-dropwizard/src/main/java/io/prometheus/metrics/instrumentation/dropwizard/DropwizardExports.java

@@ -169,8 +169,9 @@ MetricSnapshot fromSnapshotAndCount(
             .quantile(0.999, snapshot.get999thPercentile() * factor)
             .build();
 
+    String name = labelMapper.isPresent() ? labelMapper.get().getName(dropwizardName) : dropwizardName;
     MetricMetadata metadata =
-        new MetricMetadata(PrometheusNaming.sanitizeMetricName(dropwizardName), helpMessage);
+        new MetricMetadata(PrometheusNaming.sanitizeMetricName(name), helpMessage);
     SummarySnapshot.SummaryDataPointSnapshot.Builder dataPointBuilder =
         SummarySnapshot.SummaryDataPointSnapshot.builder().quantiles(quantiles).count(count);
     labelMapper.ifPresent(

prometheus-metrics-instrumentation-dropwizard5/src/main/java/io/prometheus/metrics/instrumentation/dropwizard5/DropwizardExports.java

@@ -169,8 +169,9 @@ MetricSnapshot fromSnapshotAndCount(
             .quantile(0.999, snapshot.get999thPercentile() * factor)
             .build();
 
+    String name = labelMapper.isPresent() ? labelMapper.get().getName(dropwizardName) : dropwizardName;
     MetricMetadata metadata =
-        new MetricMetadata(PrometheusNaming.sanitizeMetricName(dropwizardName), helpMessage);
+        new MetricMetadata(PrometheusNaming.sanitizeMetricName(name), helpMessage);
     SummarySnapshot.SummaryDataPointSnapshot.Builder dataPointBuilder =
         SummarySnapshot.SummaryDataPointSnapshot.builder().quantiles(quantiles).count(count);
     labelMapper.ifPresent(