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summary: Frost, heat and silent-node alerts: the rules, where they show and what to do when one fires
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# Alerting

Sends a phone notification when a greenhouse leaves its range for 10 minutes.

- Rules on top of `timeseries-db.md`: below 4 C (frost), above 35 C (heat), no reading from a node for 30 minutes.
- Shown on `dashboard.md`. What to do when an alert fires: `runbook.md`.