@JsonProperty("parameters")
  public List<AlertParameter> getParameters() {
    if (null == m_parameters) {
      return Collections.emptyList();
    }

    return m_parameters;
  }
Gets a list of the optional parameters which govern how a parameterized
alert behaves. These are usually threshold values.

@return the list of parameters, or an empty list if none.
ambari-server/src/main/java/org/apache/ambari/server/state/alert/ParameterizedSource.java