@Override
  public String toString() {
    return "{analysis: " + _heuristicClass + ", severity: " + _severity + ", details: ["
        + StringUtils.join(_heuristicResultDetails, "    ") + "]}";
  }
Set the severity of the heuristic

@param severity The severity to be set
app/com/linkedin/drelephant/analysis/HeuristicResult.java