code: func UpdateServerMetrics(ctx context.Context, name string, code int,
  	duration time.Duration, requestBytes int64, responseBytes int64,
  	userAgent string) {
  	isRobot := (strings.Contains(userAgent, "GoogleBot") ||
  		strings.Contains(userAgent, "GoogleSecurityScanner") ||
  		userAgent == "B3M/prober")
  	serverDurationsMetric.Add(ctx, float64(int64(duration)/int64(time.Millisecond)), code, name, isRobot)
  	serverResponseStatusMetric.Add(ctx, 1, code, name, isRobot)
  	serverRequestBytesMetric.Add(ctx, float64(requestBytes), code, name, isRobot)
  	serverResponseBytesMetric.Add(ctx, float64(responseBytes), code, name, isRobot)
  }
docs: // UpdateServerMetrics updates the metrics for a handled request.