gistfile1.txt

var (
  scrapeInterval = flag.Duration("interval", 60 * time.Second, "Scrape interval")
)

// ...

tick := time.Tick(*scrapeInterval)
for {
	select {
	case conf = <-configChan:
	case <-tick:
		// ...
		tagLabels := map[string]string{}
		// ...
	}
}