WordPress at a glance
action is not described

grant_super_admin action-hook . WP 3.0.0

Fires before the user is granted Super Admin privileges.

Usage

add_action( 'grant_super_admin', 'action_function_name_7339' );
function action_function_name_7339( $user_id ){
	// action...
}
$user_id(int)
ID of the user that is about to be granted Super Admin privileges.

Where the hook is called

grant_super_admin()
wp-includes/capabilities.php 834
do_action( 'grant_super_admin', $user_id );

Where the hook is used (in WP core)

Does not used.