WordPress at a glance
action is not described

automatic_updates_complete action-hook . WP 3.8.0

Fires after all automatic updates have run.

Usage

add_action( 'automatic_updates_complete', 'action_function_name_4901' );
function action_function_name_4901( $update_results ){
	// action...
}
$update_results(array)
The results of all attempted updates.

Where the hook is called

WP_Automatic_Updater::run()
automatic_updates_complete
wp-admin/includes/class-wp-automatic-updater.php 472
do_action( 'automatic_updates_complete', $this->update_results );

Where the hook is used (in WP core)

Does not used.