public RecoveryConfig getRecoveryConfig() {
    return recoveryConfig;
  }
Get the recovery configuration settings for this host. The configuration is set whenever
any value changes. The agent uses this information to update the values on it's side.

@return Null if nothing changed since the last update, else updated configuration.
ambari-server/src/main/java/org/apache/ambari/server/agent/HeartBeatResponse.java