The systemd unit checks alerted on failure-threshold 1, on the reasoning that
the heartbeat window is the tolerance. That covers a MISSING push, but a unit
caught mid-restart - a deploy, an upgrade, a backup stopping it - pushes an
explicit false, and each of those paged and resolved ten minutes later.
2 means down on two consecutive 5-minute runs.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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