Notes
Letters from the Chart Room.
These are working notes, not a magazine. We publish when a cohort has argued something worth keeping.
Event taxonomies that still make sense in year three
Why verbs beat features, and why “misc” is a future invoice.
Funnel leakage is not a metric
Drop-off is a story about instrumentation as often as it is a story about users.
When DAU starts lying to a product team
Lock screens, shared tablets, and the daily number that survives every meeting.
Cohort windows for apps that bill monthly
Calendar days are a magazine habit. Billing objects are the country you actually live in.
Instrumentation debt in mobile SDKs
The event you cannot retire, the version you cannot reach, and the quiet cost of a dual-write.