quarry-probe

Cloudflare Worker that watches the forge from outside the host. Cron every minute: GET https://zeitforge.app/api/v1/version (10 s timeout; healthy = 200 and ready:true), and when healthy GET /r/quarry/timeline.

• Down: alert after 2 consecutive unhealthy checks, once per incident, then a recovery mail with the outage length.
• Up but broken: timeline answers 5xx twice in a row with a healthy version endpoint. A 503 within 3 minutes of a version change (a deploy restart) is ignored.
• GET on the Worker URL returns its current state as JSON (no secrets).

Logic lives in src/logic.js as pure functions; npm test runs node --test with no network.

Deploy

1. cd scripts/probe && npm install
2. npx wrangler kv namespace create PROBE_STATE, paste the id into wrangler.toml.
3. In the Cloudflare dashboard, Email Routing for the zone: enable it and verify the destination address.
4. Edit wrangler.toml: ALERT_TO (the verified address, also destination_address of send_email) and ALERT_FROM (an address on the Email Routing zone).
5. npx wrangler deploy
6. Open the workers.dev URL and confirm the JSON state updates each minute.