Focused crawls are collections of frequently-updated webcrawl data from narrow (as opposed to broad or wide) web crawls, often focused on a single domain or subdomain.
The Wayback Machine - https://web.archive.org/web/20210716172027/https://docs.github.com/cn/github/administering-a-repository/configuring-pull-request-merges/managing-the-automatic-deletion-of-branches