code: public com.google.api.ads.admanager.axis.v201808.FrequencyCapBehavior getFrequencyCapBehavior() {
          return frequencyCapBehavior;
      }
docs: Gets the frequencyCapBehavior value for this AdRule.
  
  @return frequencyCapBehavior   * The {@link FrequencyCapBehavior} of the {@link AdRule}. This
  attribute is
  optional and defaults to {@link FrequencyCapBehavior#DEFER}.