How to Set Up Meaningful Error Monitoring in Next.js 15 Using Sentry

Relying on user complaints to detect application errors is not a monitoring strategy, prompting developers to adopt structured tools like Sentry for Next.js 15 projects. A key configuration detail is setting tracesSampleRate to 0.1 rather than 1.0, which balances performance visibility against cost and noise at scale. Next.js error boundaries and Server Actions are silent by default, meaning errors must be explicitly reported via Sentry's captureException to surface in dashboards. Tagging errors with context such as the triggering action name and the affected user session makes investigation significantly faster. Filtering out non-actionable noise like bot traffic and browser extension errors, combined with scoped alerting rules, keeps monitoring signals relevant and prevents alert fatigue.