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monitoring: off-host Prometheus dead-man's-switch watchdog (Pi .227)

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Independent-hardware systemd timer on raspberrypi (.227) probing media-server
Prometheus /-/healthy every 60s; pages ntfy prometheus-critical after 3 fails
and on recovery. Catches media-server-dark, which the same-host Uptime-Kuma
monitor structurally cannot. Deployed + live-outage tested 2026-06-30.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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tommy
2026-06-30 21:57:56 -05:00
parent 0be9ae426b
commit 6af09ef9c6
5 changed files with 88 additions and 0 deletions
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monitoring/prometheus-offhost-watchdog/prometheus-watchdog.timer
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[Unit]
Description=Run Prometheus watchdog every minute
[Timer]
OnBootSec=2min
OnUnitActiveSec=60s
AccuracySec=5s
[Install]
WantedBy=timers.target