@Override
  public int hashCode() {
    int result = 17;
    final int mult = 37;

    result = mult * result + severity;
    result = mult * result + (name == null ? 0 : name.hashCode());

    return result;
  }
Returns a hash code for the object. This method is supported for the benefit of hashtables such
as those provided by java.util.Hashtable.

@return the integer 0 if description is null; otherwise a unique integer.
geode-core/src/main/java/org/apache/geode/admin/AlertLevel.java