cronutil

func ApplyCronJitter ¶

func ApplyCronJitter(emitterID, schedule string, window time.Duration) string

ApplyCronJitter deterministically shifts the minute field of a standard 5-field cron expression by hash(emitterID) % floor(window/minute) minutes, spreading emitters that share a schedule across the window instead of firing them all on the same tick.

It never fails: a zero or sub-minute window, an empty emitter ID, an unsupported minute-field shape (ranges, names, descriptors), or a rewritten expression that fails cron.ParseStandard all return the schedule unchanged.