Resources

Everything you need to model it.

Documentation, a reference implementation of the metrics most teams need, and a running list of what changed.

Metric library

Definitions worth stealing.

Opinionated starting definitions. Copy them into your workspace and argue from there.

Activation
The first product action that separates 90-day retention by 15 points or more.
Net revenue retention
Expansion minus contraction and churn, over a fixed cohort, trailing 12 months.
Time to first value
Signup to the first action a second person in the account benefits from.
Gross churn
Revenue lost from cancellations and downgrades, excluding involuntary failures.
Signal to noise
Alerts that led to an action, over alerts fired. Below 0.3 means retune.