Crawl engine
A crawl starts at your homepage and follows links within your Site. Collects HTTP status, redirects, canonical tags, meta robots, and link data.
When to run a crawl
Use Deep Scan when you need page-level responses and link observations to compare with your sitemap. A governance check and sitemap scan do not themselves perform a complete website crawl. Deep Scan requires an eligible plan and an Editor or Admin role.
Start a crawl explicitly, read its completion state, and investigate limits or errors before relying on totals. It is not scheduled automatically. Follow Running a crawl and Understanding results.