Hi Aaron 👋
Metrics in GrowthBook are the key performance indicators that your experiments are trying to improve or at least not harm.
They can be defined in various ways, including using Fact Tables, and they can have different units and statistical distributions such as binomial, count, duration, and revenue.
Each of these metric types uses some form of aggregation, often defaulting to ​`SUM`​, per user and then takes an average with respect to the total number of users (
source).