in metrics/metrics_statsd.go [118:124]
func (b *statsdReporter) RecordTimer(name string, tags Tags, d time.Duration) {
t := make([]string, 0, len(tags))
for k, v := range tags {
t = append(t, fmt.Sprintf("%s:%s", k, v))
}
b.client.TimeInMilliseconds(name, d.Seconds()*1000, t, 1.0)
}