webVitalsAttribution not working

[kirchnerto]

Summary

Hey everyone,

I'm trying to get the experimental feature "webVitalsAttribution" to working. I followed the instruction to log the webvitals metrics (https://nextjs.org/docs/app/api-reference/functions/use-report-web-vitals) and added the experimental option inside the config like here https://nextjs.org/docs/app/api-reference/next-config-js/webVitalsAttribution.

I managed to get the web vitals logged to the console but still without the attribution add-on.
I tried the same on a boilerplate template here: https://nextjs-demo-five-nu.vercel.app/ (no attribution)

Has anyone got the experimental webVitalsAttribution up and running for debugging lately?

Best wishes,
Tobias

Additional information

No response

Example

No response

[danyaridiger]

What I managed to find out: attribution appears only in Cumulative Layout Shift entries regardless of whether the option webVitalsAttribution is specified.