wp-includes/ms-blogs.php:732Checks if a particular blog is archived.
$idintstringfunction is_archived( $id ) { return get_blog_status( $id, 'archived' );}Introduced in MU (3.0.0). Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ms-blogs.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.