wp-includes/ms-site.php:1128Deletes everything from site meta matching meta key.
$meta_keystringboolfunction delete_site_meta_by_key( $meta_key ) { return delete_metadata( 'blog', null, $meta_key, '', true );}Introduced in 5.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ms-site.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.