const github.com/prometheus/client_golang/prometheus.capMetricChan

3 uses

	github.com/prometheus/client_golang/prometheus (current package)
		registry.go#L39: 	capMetricChan = 1000
		registry.go#L408: 		checkedMetricChan   = make(chan Metric, capMetricChan)
		registry.go#L409: 		uncheckedMetricChan = make(chan Metric, capMetricChan)