public double[] getSnapshotTimesMillis() {
      return archive.getTimeStamps().getTimeValuesSinceIdx(firstTSidx);
    }
Returns an array of doubles containing the timestamps at which this instances samples where
taken. Each of these timestamps is the difference, measured in milliseconds, between the
sample time and midnight, January 1, 1970 UTC. Although these values are double they can
safely be converted to <code>long</code> with no loss of information.
geode-core/src/main/java/org/apache/geode/internal/statistics/StatArchiveReader.java