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Fix when multiple label names normalize to the same string #824

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Fix when multiple label names normalize to the same string #824

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8 changes: 6 additions & 2 deletions src/main/java/io/prometheus/cloudwatch/CloudWatchCollector.java
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Original file line number Diff line number Diff line change
Expand Up @@ -639,8 +639,12 @@ private void scrape(List<MetricFamilySamples> mfs) {
// "tag_" prefix
// The AWS tags are case sensitive, so to avoid loosing information and label
// collisions, tag keys are not snaked cased
labelNames.add("tag_" + safeLabelName(tag.key()));
labelValues.add(tag.value());
String labelName = "tag_" + safeLabelName(tag.key());
// If multiple labels end up with the same safe label name, use only the first
if (!labelNames.contains(labelName)) {
labelNames.add(labelName);
labelValues.add(tag.value());
}
}

infoSamples.add(
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