[BUG]: 5.41.1 caused a substantial increase in number of increment counters.

[howinator]

Tracer Version(s)

5.41.1

Node.js Version(s)

22.14

Bug Report

Upgrading 5.41.1 to broke a number of our metrics. We're having a hard time tracking down exactly what happened, but something in 5.41.1 definitely caused some of our counter metrics to increase by an order of magnitude.

In the chart below, we deployed a PR where the only substantive change was upgrading from 5.40.0 to 5.41.1.

We're currently downgrading the version to confirm this is the cause.

Perhaps related, our count metrics in Datadog are now type=gauge.

Reproduction Code

This is our code to increment a metric.

export type MetricTags = Partial<Record<MetricTag, string | number>>;

export function increment(
  namespace: MetricNamespace,
  metric: MetricName,
  amount: number,
  tags?: MetricTags, // Accept string | undefined to make it easier for the client
) {
  ddTracer.dogstatsd.increment(getStat(namespace, metric), amount, tags);
}

Error Logs

No response

Tracer Config

No response

Operating System

No response

Bundling

Unsure

[howinator]

I'll let you all debug, but #5347 looks like it may result in the behavior we're seeing

[alexbidule]

The same issues was observed in our application. Rolling back to 5.41.0 fixed the issue. So there must be something wrong in 5.41.1.

[MMShep97]

previous 2 issues are related:

#5389
#5394