How do you handle churn caused by silent disengagement rather than active dissatisfaction?

The most dangerous type of churn isn't the angry customer leaving detailed feedback—it's the silent user who just quietly slips away.

When users cancel with a complaint, at least they tell you why. But most of our churned accounts simply stopped opening the app three weeks before they actually hit the cancel button.

For founders tracking retention data: what early warning metrics or behavioral triggers do you use to step in before an account goes completely cold?