private Map<String, Map<String, String>> config(String clusterName) throws AmbariException {
    return configHelper.getEffectiveConfigProperties(clusterName, null);
  }
A special {@link JMXHostProvider} that resolves JMX URIs based on cluster configuration.
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/ConfigBasedJmxHostProvider.java