Your site must currently have the **REST API accessible** to unauthenticated frontend visitors since this is how real user metrics are collected about pages on your site; nevertheless, [exploration](https://github.com/WordPress/performance/issues/1311) is underway for providing alternative mechanisms for collecting the metrics. Also, please note that no metrics are currently collected from Safari since it does not yet support the [Largest Contentful Paint](https://developer.mozilla.org/en-US/docs/Web/API/LargestContentfulPaint) metric, but support for this [Core Web Vitals](https://web.dev/explore/learn-core-web-vitals) metric is coming this year [via Interop 2025](https://webkit.org/blog/16458/announcing-interop-2025/#core-web-vitals).
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