code: protected synchronized void incrFilesFixed(long incr) {
      if (incr < 0) {
        throw new IllegalArgumentException("Cannot increment by negative value " +
                                           incr);
      }
      
      RaidNodeMetrics.getInstance(RaidNodeMetrics.DEFAULT_NAMESPACE_ID).filesFixed.inc(incr);
      numFilesFixed += incr;
    }
docs: Increments the number of corrupt files that have been fixed by this
  integrity monitor.