bugzilla.redhat.com has a sitemap extension: https://bugzilla.redhat.com/docs/en/html/integrating/api/Bugzilla/Extension/RedHat/bin/sitemap.html Which generates sitemaps for all bugs. This makes bugs more discoverable since search engines are not allowed to use buglist.cgi See also https://www.sitemaps.org/
Source code is here: https://www.pagure.io/Red-Hat-Bugzilla/rh-bugzilla