CentraSite User's Guide : Runtime Governance : Run-Time Events and Key Performance Indicator (KPI) Metrics : The Metrics Tracking Interval
The Metrics Tracking Interval
Mediator tracks performance metrics by intervals. Interval is a period of time you set in Mediator, during which metrics are collected for reporting to CentraSite. You set the interval in the Publish Interval field on the Mediator > Administration > CentraSite Communication page in the Integration Server Administrator. For details, see Administering webMethods Mediator.
Mediator only tracks metrics for the current interval. At the end of the interval, Mediator aggregates the metrics and reports them to CentraSite. Once the metrics are reported, Mediator resets its counters for the new interval. Mediator does not calculate and aggregate metrics across intervals. If Mediator is shut down or the virtual service is undeployed before the current interval expires, the performance data is discarded.
Note:  
To avoid the need for Mediator to store metrics during periods of inactivity, Mediator stores only first and last zero value metrics that occurs during an interval, and discards the remaining consecutive zero value metrics. Doing this reduces the storage space consumed by the metrics, and speeds the queries you perform in the dashboard. Skipping the in-between zero metrics does not affect in the performance graphs shown in the dashboard.
For more information about the metrics tracking interval, see Administering webMethods Mediator.
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