core/src/main/java/org/apache/brooklyn/enricher/stock/YamlRollingTimeWindowMeanEnricher.java [127:151]:
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    public ConfidenceQualifiedNumber getAverage(long fromTime, long graceAllowed) {
        if (timestamps.isEmpty()) {
            return lastAverage = new ConfidenceQualifiedNumber(lastAverage.value, 0.0d);
        }
        
        long firstTimestamp = -1;
        Iterator<Long> ti = timestamps.iterator();
        while (ti.hasNext()) {
            firstTimestamp = ti.next();
            if (firstTimestamp>0) break;
        }
        if (firstTimestamp<=0) {
            // no values with reasonable timestamps
            return lastAverage = new ConfidenceQualifiedNumber(values.get(values.size()-1).doubleValue(), 0.0d);
        }

        long lastTimestamp = timestamps.get(timestamps.size()-1);

        long now = fromTime;
        if (lastTimestamp > fromTime - graceAllowed) {
            // without this, if the computation takes place X seconds after the publish,
            // we treat X seconds as time for which we have no confidence in the data
            now = lastTimestamp;
        }
        pruneValues(now);
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policy/src/main/java/org/apache/brooklyn/policy/enricher/RollingTimeWindowMeanEnricher.java [141:165]:
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    public ConfidenceQualifiedNumber getAverage(long fromTime, long graceAllowed) {
        if (timestamps.isEmpty()) {
            return lastAverage = new ConfidenceQualifiedNumber(lastAverage.value, 0.0d);
        }
        
        long firstTimestamp = -1;
        Iterator<Long> ti = timestamps.iterator();
        while (ti.hasNext()) {
            firstTimestamp = ti.next();
            if (firstTimestamp>0) break;
        }
        if (firstTimestamp<=0) {
            // no values with reasonable timestamps
            return lastAverage = new ConfidenceQualifiedNumber(values.get(values.size()-1).doubleValue(), 0.0d);
        }

        long lastTimestamp = timestamps.get(timestamps.size()-1);

        long now = fromTime;
        if (lastTimestamp > fromTime - graceAllowed) {
            // without this, if the computation takes place X seconds after the publish,
            // we treat X seconds as time for which we have no confidence in the data
            now = lastTimestamp;
        }
        pruneValues(now);
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