code: public java.util.List<String> getExtendedStatistics() {
          if (extendedStatistics == null) {
              extendedStatistics = new com.amazonaws.internal.SdkInternalList<String>();
          }
          return extendedStatistics;
      }
docs: <p>
  The percentile statistics. Specify values between p0.0 and p100. When calling <code>GetMetricStatistics</code>,
  you must specify either <code>Statistics</code> or <code>ExtendedStatistics</code>, but not both. Percentile
  statistics are not available for metrics when any of the metric values are negative numbers.
  </p>
  
  @return The percentile statistics. Specify values between p0.0 and p100. When calling
  <code>GetMetricStatistics</code>, you must specify either <code>Statistics</code> or
  <code>ExtendedStatistics</code>, but not both. Percentile statistics are not available for metrics when
  any of the metric values are negative numbers.