Function GetLabels

pkg/util/metrics_helper.go:772–810

GetLabels returns list of label combinations used by this collector at the time of call. This can be used to find and delete unused metrics.

(c prometheus.Collector, filter map[string]string)

// GetLabels returns list of label combinations used by this collector at the time of call.
// This can be used to find and delete unused metrics.
func GetLabels(c prometheus.Collector, filter map[string]string) ([]labels.Labels, error) {
	ch := make(chan prometheus.Metric, 16)

	go func() {
		defer close(ch)
		c.Collect(ch)
	}()

	errs := tsdb_errors.NewMulti()
	var result []labels.Labels
	dtoMetric := &dto.Metric{}
	lbls := labels.NewBuilder(labels.EmptyLabels())

nextMetric:
	for m := range ch {
		err := m.Write(dtoMetric)
		if err != nil {
			errs.Add(err)
			// We cannot return here, to avoid blocking goroutine calling c.Collect()
			continue
		}

		lbls.Reset(labels.EmptyLabels())
		for _, lp := range dtoMetric.Label {
			n := lp.GetName()
			v := lp.GetValue()

			filterValue, ok := filter[n]
			if ok && filterValue != v {
				continue nextMetric
			}

			lbls.Set(lp.GetName(), lp.GetValue())
		}
		result = append(result, lbls.Labels())
	}

	return result, errs.Err()
}

// DeleteMatchingLabels removes metric with labels matching the filter.
func DeleteMatchingLabels(c CollectorVec, filter map[string]string) error {