Use short class name for GaugeDataPointSnapshot to satisfy errorprone

Author: anuq

exporters/prometheus/src/test/java/io/opentelemetry/exporter/prometheus/Otel2PrometheusConverterTest.java

@@ -43,6 +43,7 @@
 import io.opentelemetry.sdk.resources.Resource;
 import io.prometheus.metrics.expositionformats.ExpositionFormats;
 import io.prometheus.metrics.model.snapshots.CounterSnapshot;
+import io.prometheus.metrics.model.snapshots.GaugeSnapshot.GaugeDataPointSnapshot;
 import io.prometheus.metrics.model.snapshots.Labels;
 import io.prometheus.metrics.model.snapshots.MetricSnapshot;
 import io.prometheus.metrics.model.snapshots.MetricSnapshots;
@@ -591,9 +592,8 @@ void exemplarLabelsWithinLimit() {
     MetricSnapshots snapshots = converter.convert(Collections.singletonList(metricData));
     assertThat(snapshots).isNotNull();
     // Labels within limit — both trace/span and filtered attribute should be present
-    io.prometheus.metrics.model.snapshots.GaugeSnapshot.GaugeDataPointSnapshot point =
-        (io.prometheus.metrics.model.snapshots.GaugeSnapshot.GaugeDataPointSnapshot)
-            snapshots.get(0).getDataPoints().get(0);
+    GaugeDataPointSnapshot point =
+        (GaugeDataPointSnapshot) snapshots.get(0).getDataPoints().get(0);
     Labels exemplarLabels = point.getExemplar().getLabels();
     assertThat(exemplarLabels.get("trace_id")).isEqualTo(spanContext.getTraceId());
     assertThat(exemplarLabels.get("span_id")).isEqualTo(spanContext.getSpanId());
@@ -634,9 +634,8 @@ void exemplarLabelsExceedingLimitDropsFilteredAttributes() {
 
     MetricSnapshots snapshots = converter.convert(Collections.singletonList(metricData));
     assertThat(snapshots).isNotNull();
-    io.prometheus.metrics.model.snapshots.GaugeSnapshot.GaugeDataPointSnapshot point =
-        (io.prometheus.metrics.model.snapshots.GaugeSnapshot.GaugeDataPointSnapshot)
-            snapshots.get(0).getDataPoints().get(0);
+    GaugeDataPointSnapshot point =
+        (GaugeDataPointSnapshot) snapshots.get(0).getDataPoints().get(0);
     Labels exemplarLabels = point.getExemplar().getLabels();
     // trace_id and span_id are preserved
     assertThat(exemplarLabels.get("trace_id")).isEqualTo(spanContext.getTraceId());