WordPress at a glance
action is not described

ms_loaded action-hook . WP 4.6.0

Fires after the current site and network have been detected and loaded in multisite's bootstrap.

Usage

add_action( 'ms_loaded', 'action_function_name_4459' );
function action_function_name_4459(){
	// action...
}

Where the hook is called

In file: /wp-includes/ms-settings.php
ms_loaded
wp-includes/ms-settings.php 123
do_action( 'ms_loaded' );

Where the hook is used (in WP core)

Does not used.