code: public AwsSecurityFindingFilters withFirstObservedAt(DateFilter... firstObservedAt) {
          if (this.firstObservedAt == null) {
              setFirstObservedAt(new java.util.ArrayList<DateFilter>(firstObservedAt.length));
          }
          for (DateFilter ele : firstObservedAt) {
              this.firstObservedAt.add(ele);
          }
          return this;
      }
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>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setFirstObservedAt(java.util.Collection)} or {@link #withFirstObservedAt(java.util.Collection)} if you
  want to override the existing values.
  </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.
  @return Returns a reference to this object so that method calls can be chained together.