Method Gc

internal/metrics/store.go:156–180

Gc iterates through the Store looking for metrics that can be tidied up, if they are passed their expiry or sized greater than their limit.

()

// Gc iterates through the Store looking for metrics that can be tidied up,
// if they are passed their expiry or sized greater than their limit.
func (s *Store) Gc() error {
	glog.Info("Running Store.Expire()")
	now := time.Now()
	return s.Range(func(m *Metric) error {
		if m.Limit > 0 && len(m.LabelValues) >= m.Limit {
			for i := len(m.LabelValues); i > m.Limit; i-- {
				m.RemoveOldestDatum()
			}
		}
		for i := 0; i < len(m.LabelValues); i++ {
			lv := m.LabelValues[i]
			if lv.Expiry <= 0 {
				continue
			}
			if now.Sub(lv.Value.TimeUTC()) > lv.Expiry {
				err := m.RemoveDatum(lv.Labels...)
				if err != nil {
					return err
				}
				i--
			}
		}
		return nil
	})
}

// StartGcLoop runs a permanent goroutine to expire metrics every duration.
func (s *Store) StartGcLoop(ctx context.Context, duration time.Duration) {