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feature: include CLS sources on ui.webvitals.cls span #16707

Description

@bcoe

Problem Statement

The browser SDK provides a list of the elements that were shifted by a CLS event, we should include this as an attribute on spans, as it would help people root cause:

See: https://developer.mozilla.org/en-US/docs/Web/API/LayoutShift/sources

Solution Brainstorm

This value should be available from the web vitals SDK, we just need to add it as an attribute.

Activity

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