How to Methodically Debug a Signup Regression After a Next.js Deployment

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When a Next.js release causes a signup drop, teams should resist panic and instead begin with a focused, structured review anchored to the exact deploy timestamp. Rather than treating signup as a single metric, engineers should isolate the specific route affected — such as /signup, /auth/callback, or /onboarding/workspace — and define a precise success event like account creation or invite acceptance. Deploy context including commit SHA, pull request scope, and affected paths should be captured immediately while details are fresh. Funnel tools like PostHog can reveal where users drop off, while Sentry provides runtime error and trace data to identify whether code changes caused the regression. Crucially, teams must also account for shifts in traffic source, device mix, or campaign exposure before concluding that the deploy itself is responsible.

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