drupflare/worker - v1.0.4
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    Variable WARM_MARGIN_MIN_MSConst

    WARM_MARGIN_MIN_MS: 500

    The margin below the hibernation threshold; the one free parameter in the model.

    Any interval under the threshold prevents every cold boot equally, so the optimum is the largest safe one (9,500 fires 9,094 times a day against 10,800). How late an alarm may fire is unmeasured, so 9,500 is a ceiling solveWarmInterval climbs toward, not a default.