public int getMetricsServiceRequestTTL() {
    return Integer.parseInt(getProperty(METRIC_RETRIEVAL_SERVICE_REQUEST_TTL));
  }
Gets the number of seconds that requests made to the same URL will be discarded in order to
throttle the retrieval from the same endpoint.

@return the number of seconds that must elapse between requests to the same endpoint.
ambari-server/src/main/java/org/apache/ambari/server/configuration/Configuration.java