Product & Analytics / Performance & Reliability

Core Web Vitals LCP / INP / CLS (also "page-experience signals")

A trio of page-experience metrics -- loading, interactivity, and visual stability -- as felt by real users.

The fork, why two teams get different numbers

FIELD vs LAB is the central split.

In the Metric Library

The full fork, both definitions worked all the way through
The trap that makes the number lie, on a real export
Every formula variant, spelled out
The reconciliation anchor, what to tie it to and when to refuse

Reference: Google web.dev Core Web Vitals thresholds and Chrome UX Report cited as reference (definitions not reproduced); W3C Web Performance timing APIs