WordPress at a glance
action is not described

added_usermeta action-hook . WP 1.0

Usage

add_action( 'added_usermeta', 'action_function_name_7081', 10, 4 );
function action_function_name_7081( $insert_id, $user_id, $meta_key, $meta_value ){
	// action...
}
$insert_id
-
$user_id
-
$meta_key
-
$meta_value
-

Where the hook is called

update_usermeta()
added_usermeta
wp-includes/deprecated.php 2350
do_action( 'added_usermeta', $wpdb->insert_id, $user_id, $meta_key, $meta_value );

Where the hook is used (in WP core)

Does not used.