I want to use AWS CloudFront custom metrics to create a count tracker for special requests (per unique user identified by userName).
I am able to send data to CloudFront using code sample shared below.
The data getting captured is not cumulative but always shows count as 1 even after multiple requests.When I visualise this data in graphs I don’t see the count getting increment but is plotted as points with the value 1 for 5 mins interval.

Is there something wrong with my usage?

const data = {
    MetricData: [
      {
        MetricName: "special_req_count",
        Dimensions: [
          {
            Name: "user",
            Value: userName,
          },
        ],
        Unit: "Count",
        Value: 1
      },
    ],
    Namespace: "CustomMetrics",
  }
  const command = new PutMetricDataCommand(data)
  const response = await cwClient.send(command)

thanks