| title: config.analytics is deprecated | |
| ## Why This Error Occurred | |
| The Core Web Vitals of your Next.js application could be tracked and sent to any backend of your choice. | |
| Earlier version of Next.js enable tracking by specifying `analyticsId` into your `next.config.js` file. | |
| This configuration mechanism will be removed in nextjs@15, as it could be elegantly replaced with `useReportWebVitals` built-in hook. | |
| ## Possible Ways to Fix It | |
| To remove this warning, you must remove `analyticsId` from your `next.config.js` file. | |
| To keep tracking your Core Web Vitals, you could: | |
| - use `useReportWebVitals` hook as explained [here](/docs/app/api-reference/functions/use-report-web-vitals) and send the metrics to any backend of your choice. | |
| - [install and use](https://vercel.com/docs/speed-insights/quickstart) `@vercel/speed-insights` package into your application | |