We have created a calculated metrics based on minimum number of NumUnavailable metrics. The observation is the calculated metrics does not show the minimum value of the parent metrics, it seems it shows the average value instead.
Release : SAAS
Component : Integration with APM
Management Module Calculator "min" operation calculates the matched metrics. For example, if 5 metrics are selected, it will look at all 5 metrics and take the minimum value of all 5. It will not look at the actual "min" of the metrics over a range of time. It is only looking at the metric value.