Why Funnel Tiles Lie After a Release

A conversion workspace fails more often from messy events than from slow queries. A renamed onboarding step, a client that fires the same purchase twice, or a billing webhook that arrives hours late will all produce charts that look decisive and still mislead Monday’s stand-up.

Build a weekly sanity check: volume versus expected traffic, uniqueness of transaction IDs, and a sample of raw payloads against the event dictionary. When something drifts, freeze the affected funnel step rather than letting a broken series keep updating.

Teams that treat instrumentation as a living contract — with owners, review cadence, and QA on every release — keep their self-serve conversion views trustworthy long after the first sprint ends.