in metrics/metrics_statsd.go [110:116]
func (b *statsdReporter) ReportGauge(name string, tags Tags, value int64) {
t := make([]string, 0, len(tags))
for k, v := range tags {
t = append(t, fmt.Sprintf("%s:%s", k, v))
}
b.client.Gauge(name, float64(value), t, 1.0)
}