code: public void setFirstObservedAt(java.util.Collection<DateFilter> firstObservedAt) {
          if (firstObservedAt == null) {
              this.firstObservedAt = null;
              return;
          }
  
          this.firstObservedAt = new java.util.ArrayList<DateFilter>(firstObservedAt);
      }
docs: <p>
  An ISO8601-formatted timestamp that indicates when the potential security issue captured by a finding was first
  observed by the security findings provider.
  </p>
  
  @param firstObservedAt
  An ISO8601-formatted timestamp that indicates when the potential security issue captured by a finding was
  first observed by the security findings provider.