// that were missed since there were no available workers.
func (e *expiryStats) MissedTierJournalTasks() int64 {
	return e.missedTierJournalTasks.Load()
}

// NumWorkers returns the number of active workers executing one of ILM expiry
// tasks or free version collection tasks.
func (e *expiryStats) NumWorkers() int32 {
	return e.workers.Load()
}

type expiryOp interface {
	OpHash() uint64
}