Fixed rate

Run at a steady rate

Use ScheduleAtFixedRate when the interval itself is the important part of the schedule.

scheduler.ScheduleAtFixedRate(func(ctx context.Context) {
	println("collect metrics")
}, 10*time.Second)

Fixed rate schedules are useful for metrics, heartbeats, and periodic checks where the application expects a steady cadence.

Pick fixed rate intentionally

Fixed rate is different from fixed delay. Fixed delay waits after each task finishes. Fixed rate targets a regular interval.

scheduler.ScheduleAtFixedRate(func(ctx context.Context) {
	println("publish heartbeat")
}, 30*time.Second)

Use fixed rate when the schedule represents a clock-like cadence rather than a pause after each completed run.