Sentry

Overview

Sentry is an error monitoring and performance platform that captures unhandled exceptions, tracks request performance with Web Vitals, records session replays, and alerts on regressions. It supports JavaScript, Python, Go, and mobile platforms with auto-instrumentation, source-mapped stack traces, and release health tracking.

Instructions

• When integrating the SDK, call Sentry.init() with dsn, environment, release, and tracesSampleRate, choosing the framework-specific SDK (@sentry/nextjs, @sentry/sveltekit, sentry-sdk for Python) for automatic instrumentation.
• When configuring error tracking, set up Sentry.setUser() after login for user correlation, add custom tags with Sentry.setTag() for filtering, and configure ignoreErrors for known harmless errors from browser extensions and third-party scripts.
• When uploading source maps, use @sentry/vite-plugin or @sentry/webpack-plugin in the CI build step to map minified stack traces back to original source code, associating them with the release version.
• When monitoring performance, set tracesSampleRate to 0.1-0.2 in production, add custom spans with Sentry.startSpan() for business-critical operations, and monitor Web Vitals (LCP, CLS, INP) for real user experience.
• When setting up alerts, configure rules for error rate spikes rather than individual errors, integrate with Slack or PagerDuty, and filter by environment and error level.
• When using session replay, set replaysOnErrorSampleRate: 1.0 for all error sessions and replaysSessionSampleRate: 0.1 for general sampling, with privacy masking for sensitive data.

Examples

Example 1: Set up Sentry for a Next.js production app