in opencensus-exporter/src/main/java/com/spotify/ffwd/FfwdMetricsConverter.java [173:183]
static Map<String, String> createTags(List<LabelKey> keys, List<LabelValue> values) {
final HashMap<String, String> tags = new HashMap<>(keys.size());
for (int i = 0; i < values.size(); i++) {
LabelValue value = values.get(i);
if (Strings.isNullOrEmpty(value.getValue())) {
continue;
}
tags.put(keys.get(i).getKey(), value.getValue());
}
return tags;
}