Add stat namespace prefix option for Librato adapter

librato/librato.go

@@ -23,6 +23,7 @@ func translateTimerAttributes(d time.Duration) (attrs map[string]interface{}) {
 
 type Reporter struct {
 	Email, Token    string
+	Namespace       string
 	Source          string
 	Interval        time.Duration
 	Registry        metrics.Registry
@@ -32,7 +33,7 @@ type Reporter struct {
 }
 
 func NewReporter(r metrics.Registry, d time.Duration, e string, t string, s string, p []float64, u time.Duration) *Reporter {
-	return &Reporter{e, t, s, d, r, p, translateTimerAttributes(u), int64(d / time.Second)}
+	return &Reporter{e, t, "", s, d, r, p, translateTimerAttributes(u), int64(d / time.Second)}
 }
 
 func Librato(r metrics.Registry, d time.Duration, e string, t string, s string, p []float64, u time.Duration) {
@@ -87,6 +88,9 @@ func (self *Reporter) BuildRequest(now time.Time, r metrics.Registry) (snapshot
 	snapshot.Counters = make([]Measurement, 0)
 	histogramGaugeCount := 1 + len(self.Percentiles)
 	r.Each(func(name string, metric interface{}) {
+		if self.Namespace != "" {
+			name = fmt.Sprintf("%s.%s", self.Namespace, name)
+		}
 		measurement := Measurement{}
 		measurement[Period] = self.Interval.Seconds()
 		switch m := metric.(type) {