Buckets:        metrics.ExponentialBuckets(0.001, 2, 15),
			StabilityLevel: metrics.ALPHA,
		}, []string{"action", "error"})
	metricComputationTotal = metrics.NewCounterVec(
		&metrics.CounterOpts{
			Subsystem:      hpaControllerSubsystem,
			Name:           "metric_computation_total",

func (r *monitor) ObserveMetricComputationResult(action ActionLabel, err ErrorLabel, duration time.Duration, metricType v2.MetricSourceType) {
	metricComputationTotal.WithLabelValues(string(action), string(err), string(metricType)).Inc()
	metricComputationDuration.WithLabelValues(string(action), string(err), string(metricType)).Observe(duration.Seconds())

- HPA controller exposes the following metrics from the kube-controller-manager. 
  - `metric_computation_duration_seconds`: The time(seconds) that the HPA controller takes to calculate one metric.
  - `metric_computation_total`: Number of metric computations. ([#116326](https://github.com/kubernetes/kubernetes/pull/116326), [@sanposhiho](https://github.com/sanposhiho)) [SIG Apps, Autoscaling and Instrumentation]