public Long getMetricRequestBufferTimeCatchupInterval() {
    return Long.parseLong(getProperty(TIMELINE_METRICS_REQUEST_CATCHUP_INTERVAL));
  }
Constant fudge factor subtracted from the cache update requests to
account for unavailability of data on the trailing edge due to buffering.
ambari-server/src/main/java/org/apache/ambari/server/configuration/Configuration.java