A Magento Open Source merchant would like to see what proportion of their website traffic...

According to the Adobe Commerce Merchant Documentation, Magento Business Intelligence and Google Analytics are two reporting tools that can provide information about the traffic sources of your website, including organic search. Magento Business Intelligence is a cloud-based data platform that integrates with your Adobe Commerce store and allows you to create custom reports and dashboards. Google Analytics is a web analytics service that tracks and reports website traffic and behavior.

References: https://docs.magento.com/user-guide/reports/magento-business-intelligence.html https://docs.magento.com/user-guide/marketing/google-universal-analytics.html