SlpSoftware/aidlc-docs/features/react-frontend/operations/monitoring/monitoring-setup.md

Monitoring Setup Instructions

Concrete setup steps for the approaches chosen in monitoring-plan.md: Logging and Dashboards (no Alerting).

Logging

What to log

• Uncaught JavaScript errors / exceptions (the app already has an ErrorBoundary component from Code Generation — this is the natural hook point).
• Broken/failed navigation (e.g. an unexpected router error).
• No user PII, form input, or sensitive data should ever be logged — this is a public marketing site, but keep this discipline regardless.

Destination — decided: Sentry free tier + console

Both the console and Sentry are now active (original Question 3 resolved as a combination):

Console (always on)

• Errors already surface via console.error inside ErrorBoundary.componentDidCatch — unchanged, zero cost, useful for local/manual debugging.

Sentry free tier (implemented)

• @sentry/react is a dependency; src/main.tsx calls Sentry.init({ ... }) at startup, but only when a DSN is present — if not configured, Sentry is silently skipped and only console-logging remains active (safe default, no crash on missing config).
• ErrorBoundary.componentDidCatch calls Sentry.captureException(error, { extra: { componentStack: info.componentStack } }) in addition to console.error.
• Tracing/performance is also enabled (Sentry's recommended default alongside error monitoring, per the official React SDK setup guide): tanstackRouterBrowserTracingIntegration(router) is wired up so route navigations are captured as transactions, with tracesSampleRate: 1.0 (capture all — appropriate for a low-traffic marketing site; lower this if traffic grows significantly).
• Environment/release tagging: environment is set to import.meta.env.MODE (e.g. production) and release is set to the app version from package.json (injected at build time via vite.config.ts's define: { __APP_VERSION__ }), so events in Sentry can be filtered/grouped per environment and per shipped version.
• The DSN is injected at build time via Vite's import.meta.env.VITE_SENTRY_DSN (typed in src/vite-env.d.ts). It is not a secret (Sentry DSNs are safe to expose client-side), so it is passed as a Gitea Actions repository variable (vars.VITE_SENTRY_DSN, not a secret) to the Build step in continuous_integration.yaml.
• Manual follow-up required: create a free Sentry project (https://sentry.io) for this app, copy its DSN, and set it as the VITE_SENTRY_DSN repository variable in Gitea (Repository Settings → Actions → Variables). Until that variable is set, the build still succeeds and the site still works — Sentry reporting simply stays inactive.
• Free tier limits (error volume, retention) are typically sufficient for a low-traffic marketing site.
• Not (yet) implemented, by explicit choice: automatic source map upload (via @sentry/vite-plugin), which the official Sentry setup guide also recommends so stack traces show real source code instead of minified code. This requires a Sentry auth token/org/project as a new Gitea secret; deliberately left out of scope for now — revisit if readable production stack traces become a priority.

Log level strategy: only errors are logged (no verbose/info-level client logging) — this is a static site with no meaningful "business events" beyond page views, which are covered by analytics (see Dashboards below), not logging.

Temporary manual test tool: SentryTestButton

• src/components/SentryTestButton.tsx renders a "Break the world" button, mounted globally via RootLayout.tsx, used to manually verify that errors, logs (Sentry.logger.info), and metrics (Sentry.metrics.count) actually arrive in Sentry end-to-end.
• Visibility: only shown during local development (pnpm dev, via Vite's import.meta.env.DEV) and in the test environment (via the new build-time VITE_APP_ENV variable, set to test by continuous_integration.yaml's Build step). It is hidden by default (including in any future production build) unless one of those conditions is explicitly true.
• Visual feedback: clicking the button immediately shows a green confirmation toast ("Test error verzonden naar Sentry ✅", role="status") that auto-hides after 4 seconds, so the user gets clear confirmation that the test action fired — without this, the resulting uncaught error/blank state gave no indication anything happened. The actual log/metric/throw (handleSentryTestErrorClick) is fired on the next tick (setTimeout(..., 0)) so the toast has a chance to render/paint first.
• Sentry.logger.* requires enableLogs: true in Sentry.init() (src/main.tsx) — added specifically to support this test button (and any future structured logging).
• The thrown error is intentionally uncaught: React error boundaries do not catch errors thrown from event handlers (only render/lifecycle errors), so this relies on Sentry's own global window.onerror handler, exactly like the official Sentry test snippet.
• This is a temporary verification tool, not a permanent feature — remove SentryTestButton (and its usage in RootLayout.tsx) once Sentry has been confirmed to receive test errors/logs/metrics end-to-end.

Dashboards

Website analytics

Pick one (all have generous free tiers suitable for a small marketing site):

Option	Notes
Plausible / Umami	Privacy-friendly, lightweight, no cookie banner typically required; self-hosted or low-cost hosted tier
Google Analytics (GA4) / Search Console	Free, widely known, but heavier script and involves third-party data sharing (cookie/consent implications)

Setup (once a tool is picked):

1. Create an account/site entry with the chosen provider and obtain the tracking snippet or <script> tag.
2. Add the snippet to index.html (or load it conditionally in src/main.tsx) — this is a documentation/config task, not something the current codebase needs restructuring for.
3. Key metrics to surface: unique visitors, page views per route (Home, Packages, etc. — see frontend-components.md), and referral sources.

Uptime dashboard

Pick one:

Option	Notes
UptimeRobot	Free tier: up to 50 monitors, 5-minute check interval, optional e-mail notification on downtime (opportunistic, not a designed alerting feature per monitoring-plan.md)
Better Uptime	Free tier available; similar capability, nicer public status page option

Setup (once a tool is picked):

1. Register the production URL (once hosting is finalized — see operations/deployment/deployment-plan.md "Open Item") as an HTTP(S) monitor, checking for a 200 response.
2. Optional: publish a public status page if desired for transparency to visitors.
3. Key metric to surface: uptime percentage / current status.

Summary Table

Concern	Approach	Status
Client-side errors	Logging (console + Sentry free tier)	Implemented; VITE_SENTRY_DSN Gitea variable still needs to be created by the user
Visitor/usage insight	Analytics dashboard (Plausible/Umami/GA4)	Tool selection open item
Site reachability	Uptime dashboard (UptimeRobot/Better Uptime)	Tool selection + production URL open item
Alerting	Out of scope	Not configured
Shared infrastructure reuse	Out of scope	None exists yet