Add error monitoring #707
Description
A production JS error (fixed in #706) recently went undetected because we have no error monitoring in place. Adding error monitoring would give us alerts and stack traces when errors occur in production.
Two options worth considering:
- Sentry — widely used, official SvelteKit SDK, good documentation. Free tier: 5k errors/month (excess dropped, no surprise billing). Also has a "Sentry for Good" sponsored-account program for nonprofits and open-source organizations, but approval is application-based and discretionary.
- Highlight.io — open source with SvelteKit support. Hosted free tier includes 500 sessions, 1,000 errors, 1M logs, and 25M traces/month. Less established than Sentry.