code: func UpdateHTTPMetrics(ctx context.Context, name string, client string,
  	code int, duration time.Duration, requestBytes int64, responseBytes int64) {
  	requestBytesMetric.Add(ctx, float64(requestBytes), name, client)
  	responseBytesMetric.Add(ctx, float64(responseBytes), name, client)
  	requestDurationsMetric.Add(ctx, float64(int64(duration)/int64(time.Millisecond)), name, client)
  	responseStatusMetric.Add(ctx, 1, code, name, client)
  }
docs: // UpdateHTTPMetrics updates the metrics for a request to a remote server.