code: public void setThreatIntelIndicatorLastObservedAt(java.util.Collection<DateFilter> threatIntelIndicatorLastObservedAt) {
          if (threatIntelIndicatorLastObservedAt == null) {
              this.threatIntelIndicatorLastObservedAt = null;
              return;
          }
  
          this.threatIntelIndicatorLastObservedAt = new java.util.ArrayList<DateFilter>(threatIntelIndicatorLastObservedAt);
      }
docs: <p>
  The date/time of the last observation of a threat intel indicator.
  </p>
  
  @param threatIntelIndicatorLastObservedAt
  The date/time of the last observation of a threat intel indicator.