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The current Avg duration is problematic beause it is often affected by the initial ramp-up time of the type.
As Darren and I discussed in the past, will be useful to provide a mean avg.
This can be done I think by adding to the sql metric another output - the sum of all durations.
Then in the GetMetrics method of Orchestration (in SDC.BizTalkOM) it should be possibile to return mean avg by checking the number if instances found and, if more than two found, deduct the min and max from the sum and divide by the number of instances-2; otherwise
the avg should be returned as the mean avg.