wp-admin/includes/class-wp-ms-sites-list-table.php:443Handles the ID column output.
$blogarray public function column_id( $blog ) { echo $blog['blog_id']; }Introduced in 4.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-wp-ms-sites-list-table.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.