How to add Sentry monitoring to a Webflow Cloud app

Webflow Cloud Next.js apps run on Cloudflare Workers, whose built-in metrics support capacity monitoring but not detailed debugging, so Sentry can add error grouping, stack traces, performance tracing, and session replay across browser, server component, route handler, and edge-runtime failures. The manual setup installs `@sentry/nextjs`, wraps the Next.js configuration with `withSentryConfig`, creates separate client, Node.js, edge, instrumentation, and global error-boundary files, and configures DSN, authentication token, organization, and project environment variables. A key Webflow Cloud requirement is routing events through a `tunnelRoute`, because its generated Cloudflare compatibility settings may prevent direct Worker-based Sentry delivery; the tunnel also can reduce interference from ad blockers. Validation involves deploying, triggering client and server test errors, confirming readable source-mapped stack traces, and configuring error-rate and unhandled route-handler alerts. Common silent failures include a missing or incorrect tunnel route, absent production DSN, unavailable source-map upload token, expected zero-duration CPU-only traces on Workers, and low or incorrectly configured session-replay sampling.

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