If no field data is available, does CWVs use lab data?
Eg, a site has 3/1600 URLs with field data avail. (via PageSpeed Insights API). Will the CWV update be based on lab data for the remaining 1597 URLs?
Some of these URLs do get 1K clicks/m.
Thanks in advance @JohnMu 
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So when there is no reported field RUM, what happens
? Do we address all that we can re: LCP FID CLS based on lab to achieve “good enough” and not worry about having no field data?
It's normal that not all sites have all data - we have to make do with the signals that we have access to. We don't use lab tests to compensate. On a URL level, we often make groups within a site, since they're often very similar in performance.
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Gotcha. Thanks for your time and patience!
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