Typically the configuration operation sets the value of
the EtsysSrvcLvlAggrMeasureEntry.
etsysSrvcLvlAggrMeasureTable is mandatory.
The etsysSrvcLvlAggrMeasureMetrics defines the metric to compute.
The results of the measure to summarize are identified by:
+ etsysSrvcLvlAggrMeasureHistoryOwner,
+ etsysSrvcLvlAggrMeasureHistoryOwnerIndex and
+ etsysSrvcLvlAggrMeasureHistoryMetric
The aggregated task starts at etsysSrvcLvlAggrMeasureBeginTime
and ends after etsysSrvcLvlAggrMeasureDuration. An aggregated
result is performed and saved in the etsysSrvcLvlHistoryTable
for each etsysSrvcLvlAggrMeasureAggrPeriod.