private SimpleImmutableEntry<Point, UntypedMetric> locationValuePair(Map.Entry<Identifier, UntypedMetric> entry) {
        return new SimpleImmutableEntry<>(entry.getKey().getLocation(), entry.getValue());
    }
An aggregation of data which is only written to from a single thread.

@author Steinar Knutsen
container-core/src/main/java/com/yahoo/metrics/simple/Bucket.java