code: private void setFuzzerOptin(boolean shouldOptin) {
          if (shouldOptin) {
              PassiveScanThread.addApplicableHistoryType(HistoryReference.TYPE_FUZZER);
              PassiveScanThread.addApplicableHistoryType(HistoryReference.TYPE_FUZZER_TEMPORARY);
          } else {
              PassiveScanThread.removeApplicableHistoryType(HistoryReference.TYPE_FUZZER);
              PassiveScanThread.removeApplicableHistoryType(HistoryReference.TYPE_FUZZER_TEMPORARY);
          }
      }
docs: Adds or removes the {@code HistoryReference} types that should be included
  when passive scanning traffic from the fuzzer.
  
  @param shouldOptin
  {@code true} if the types should be enabled (added)
  {@code false} if the types should be disabled (removed)
  @since TODO Add version
  @see #isScanFuzzerMessages()
  @see #setScanFuzzerMessages()