internal/cache/cache.go
func (c *Cache) Collect(in chan<- prometheus.Metric) {
	c.hitsTotal.Collect(in)
	c.refreshTotal.Collect(in)
	c.missesTotal.Collect(in)
}
func (c *Cache) Collect(in chan<- prometheus.Metric) {
	c.hitsTotal.Collect(in)
	c.refreshTotal.Collect(in)
	c.missesTotal.Collect(in)
}
// Collect implements prometheus Collector interface.