Metric

A metric is a quantitative description of activity or outcomes, such as purchase count, revenue or a calculated ratio. The GA4 schema distinguishes quantitative measurements from dimensions describing the data.[1] In revenue by product category, revenue is the metric and category is the dimension; the breakdown supplies context for the measurement.

For a store, document more than the name: specify the calculation, unit, denominator, period and data source. An average per order answers a different question from an average per customer. Do not automatically add averages or unique-user counts from separate groups either. A metric becomes a KPI through its connection to an important objective and decision, not simply because it occupies a prominent dashboard position.