OpenWAF can now measure Core Web Vitals in your visitors' browsers: LCP, INP, CLS, FCP and TTFB, with a script the edge adds to your pages and without storing IP addresses. It is off by default and is switched on per domain with a sample rate. The dashboard's Real performance page shows the p75 of each metric with its rating, and the MCP tool rum_report reads the same data.
See the Analytics documentation.