add attribution to web vitals #39368
Merged
Commits on Oct 3, 2022
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This commit implements the main proposal presented in vercel#39241 to add attribution to web vitals. Attribution adds more specific debugging info to web vitals, for example in the case of Cumulative Layout Shift (CLS), we might want to know > What's the first element that shifted when the single largest layout shift occurred? on in the case of Largest Contentful Paint (LCP), > What's the element corresponding to the LCP for the page? > If it is an image, what's the URL of the image resource? Attribution is *disabled* by default because it could potentially generate a lot data and overwhelm the RUM backend. It is enabled *per metric* (LCP, FCP, CLS, etc) As part of this change, `web-vitals` has been upgraded to v3.0.0-rc.0 This version contains minor bug fixes, please see changelog at GoogleChrome/web-vitals@9fe3cc0
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