Atalaya Uptime Monitor

Atalaya (Spanish for watchtower) is an uptime & status page monitoring service running on Cloudflare Workers and Durable Objects.

It runs entirely on Cloudflare's free tier, so you get a self-hosted uptime monitor and status page without paying for servers. It's aimed at hobbyists who want control over their monitoring and don't mind living inside Cloudflare's ecosystem.

Live example.

⚠️ 99% of the code has been generated by an AI agent under human supervision, bearing in mind that I haven't used TypeScript before. You have been warned!

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Features

• HTTP/HTTPs, TCP, and DNS monitoring.
• Regional monitoring from specific Cloudflare locations.
• Configurable retries with immediate retry on failure.
• Configurable failure thresholds before alerting.
• Custom alert templates for notifications (currently only webhooks are supported).
• Historical data stored in Cloudflare D1.
• Status page built with Astro 6 SSR, served by the same Worker via Static Assets.
  • 90-day uptime history with daily bars.
  • Response time charts (uPlot) with downtime bands.
  • Basic auth or public access modes.
  • Dark/light mode.
  • Custom banner image support with optional clickable link.

Documentation

Read the docs for setup, configuration, alerts, and more.

Development

# Run worker locally
wrangler dev --test-scheduled

# Run status page locally
pnpm dev:pages

# Trigger cron manually
curl "http://localhost:8787/__scheduled?cron=*+*+*+*+*"

Testing

# First build the status page
pnpm build:pages

# Worker tests
pnpm test

# Status page unit tests
pnpm test:pages

# Type checking and linting
pnpm check              # worker (typecheck + lint + format)
pnpm check:pages        # pages (astro check + tsc + lint)

TODO

• Add support for TLS checks (certificate validity, expiration). Apparently, the Workers API does not support certificate data access, even at the socket level. An external service may be required.
• Refine the status page to look... well... less AI-generated.
• Per-monitor maintenance windows
• Initial support for incident management (manual status overrides, incident timeline).
• Branded status page (simple custom banner).
• Add support for notifications other than webhooks.