@Override
  public int hashCode() {
    int result = Ok != null ? Ok.hashCode() : 0;
    result = 31 * result + (Warning != null ? Warning.hashCode() : 0);
    result = 31 * result + (Critical != null ? Critical.hashCode() : 0);
    result = 31 * result + (Unknown != null ? Unknown.hashCode() : 0);
    return result;
  }
The {@link AlertState#UNKNOWN} state information.
ambari-server/src/main/java/org/apache/ambari/server/api/query/render/AlertStateSummary.java