code: public void setUnprocessedTraceIds(java.util.Collection<String> unprocessedTraceIds) {
          if (unprocessedTraceIds == null) {
              this.unprocessedTraceIds = null;
              return;
          }
  
          this.unprocessedTraceIds = new java.util.ArrayList<String>(unprocessedTraceIds);
      }
docs: <p>
  Trace IDs of requests that haven't been processed.
  </p>
  
  @param unprocessedTraceIds
  Trace IDs of requests that haven't been processed.