Pin this metric down

Two teams report different numbers under the same metric name.

Turn this loose metric into a definition two teams cannot read differently. Decide explicitly: who is in the population, which timestamp defines the period, what counts as one, and what happens to test accounts, refunds, and deleted records. Give a one-paragraph definition, then the exclusions as a short list.

Metric:

Numbers and metrics. Pinning down what a metric means, what a report measures, and whether a surprising number is real.