@Override
    public int hashCode() {
      return Objects.hash(m_description, m_displayName, m_name, m_threshold, m_type, m_units, m_value, m_visibility);
    }
Gets the threshold that this parameter directly controls, or {@code null}
for none.

@return the threshold, or {@code null}.
ambari-server/src/main/java/org/apache/ambari/server/state/alert/ParameterizedSource.java