code: public java.util.List<String> getTriggerEvents() {
          if (triggerEvents == null) {
              triggerEvents = new com.amazonaws.internal.SdkInternalList<String>();
          }
          return triggerEvents;
      }
docs: <p>
  The event type or types for which notifications are triggered.
  </p>
  
  @return The event type or types for which notifications are triggered.
  @see TriggerEventType