rules/alerting.go
func (r *AlertingRule) GetEvaluationDuration() time.Duration {
	r.mtx.Lock()
	defer r.mtx.Unlock()
	return r.evaluationDuration
}
func (r *AlertingRule) GetEvaluationDuration() time.Duration {
	r.mtx.Lock()
	defer r.mtx.Unlock()
	return r.evaluationDuration
}
// GetEvaluationDuration returns the time in seconds it took to evaluate the alerting rule.