The Activity monitor measures your model activity level and its operational metrics, as variance often correlates with potential model issues and technical bugs.
Superwise offers you a number of Activity monitoring policy templates:

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Model stillness

This policy alerts if there are 0 predictions on a segment level

MetricRoleSegments
QuantityCross FeaturesAll segments

Growing populations

This policy monitors the increase in size at the segment level.

MetricRoleSegments
QuantityCross FeaturesAll segments