code: public GetMetricStatisticsRequest withStatistics(String... statistics) {
          if (this.statistics == null) {
              setStatistics(new com.amazonaws.internal.SdkInternalList<String>(statistics.length));
          }
          for (String ele : statistics) {
              this.statistics.add(ele);
          }
          return this;
      }
docs: <p>
  The metric statistics, other than percentile. For percentile statistics, use <code>ExtendedStatistics</code>.
  When calling <code>GetMetricStatistics</code>, you must specify either <code>Statistics</code> or
  <code>ExtendedStatistics</code>, but not both.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setStatistics(java.util.Collection)} or {@link #withStatistics(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param statistics
  The metric statistics, other than percentile. For percentile statistics, use
  <code>ExtendedStatistics</code>. When calling <code>GetMetricStatistics</code>, you must specify either
  <code>Statistics</code> or <code>ExtendedStatistics</code>, but not both.
  @return Returns a reference to this object so that method calls can be chained together.
  @see Statistic