`site.sitemap.entries`

Default: warn
Plugin: site

A sitemap lists only https pages of the build that search engines can index and crawl.

Why: A sitemap suggests the URLs that you want in search results. Google asks for canonical URLs only, and not the http version of a page. A listed URL that is missing, that has noindex, that has a canonical link to another URL, or that robots.txt blocks sends mixed signals, and wastes crawls.

The rule reads the same sitemaps as site.sitemap. It skips URLs on other origins, and needs a host to find the page of each URL.

When off: a sitemap can list any URL.

<!-- ✗ Fails, for a site where /draft/ has noindex -->
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
	<url><loc>http://example.com/</loc></url>
	<url><loc>https://example.com/draft/</loc></url>
</urlset>

<!-- ✓ Passes -->
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
	<url><loc>https://example.com/</loc></url>
</urlset>

References

Google: Build and submit a sitemap: List the canonical URLs that you want in results, and not the HTTP version of a page.
Google: How to specify a canonical URL: All pages in a sitemap are suggested as canonical.
Google: Robots meta tag specifications: A page with noindex stays out of results, so a sitemap should not suggest it. The rule warns.