Zeb Hering 80fc40a1ff Alarm on cooling that cannot keep up, not on load ...

A rising temperature is what a busy machine looks like; the previous
trend alarm would have mailed continuously through a multi-hour zpool
migration. trend_verdict() now alarms only when the fans are already at
maximum and it is still climbing, or when temperature and fan speed are
both rising and the rise is not decelerating.

Tells a plateau from a runaway by comparing the first half of the window
against the second - a load step settles once the fans catch up, a
failing fan does not. Verified quiet against a live migration at load
average 18 with CPU at 68c.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

2026-08-28 22:00:17 -07:00

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