wp-includes/ms-site.php:1034Adds metadata to a site.
$site_idint$meta_keystring$meta_valuemixed$uniquebooloptionalfalseint|falsefunction add_site_meta( $site_id, $meta_key, $meta_value, $unique = false ) { return add_metadata( 'blog', $site_id, $meta_key, $meta_value, $unique );}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.