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summary: The 5-minute health check: what it tests and what pass, warn and fail mean
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# Health checks

A script runs every 5 minutes and reports pass / warn / fail:

- `gateway.md` answers ping; `mqtt-broker.md` accepts a test message; `backup-job.md` ran in the last 26 hours;
  every node in `sensor-node.md` reported in the last 30 minutes; `alerting.md` sent its daily test notification.