convenience.go
func (r *Registry) Gauge(name string, tags []string) *Gauge {
	return r.fetchGauge(name, tags, newGauge)
}
func (r *Registry) Gauge(name string, tags []string) *Gauge {
	return r.fetchGauge(name, tags, newGauge)
}
func ( r * Registry ) Gauge ( name string , tags [ ] string ) * Gauge { return r . fetchGauge ( name , tags , newGauge ) }
// Gauge fetches an instrument from the registry or creates a new one.
//
// If another instrument type is already registered with the same
// name/tags, a blank one will be returned and an error
// will be logged to the Errors() channel.
Gauge fetches an instrument from the registry or creates a new one . If another instrument type is already registered with the same name / tags a blank one will be returned and an error will be logged to the Errors () channel .