code: public TraceSummary withUsers(TraceUser... users) {
          if (this.users == null) {
              setUsers(new java.util.ArrayList<TraceUser>(users.length));
          }
          for (TraceUser ele : users) {
              this.users.add(ele);
          }
          return this;
      }
docs: <p>
  Users from the trace's segment documents.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setUsers(java.util.Collection)} or {@link #withUsers(java.util.Collection)} if you want to override the
  existing values.
  </p>
  
  @param users
  Users from the trace's segment documents.
  @return Returns a reference to this object so that method calls can be chained together.