WordPress at a glance
action is not described

auth_cookie_expired action-hook . WP 2.7.0

Fires once an authentication cookie has expired.

Usage

add_action( 'auth_cookie_expired', 'action_function_name_8272' );
function action_function_name_8272( $cookie_elements ){
	// action...
}
$cookie_elements(array)
An array of data for the authentication cookie.

Where the hook is called

wp_validate_auth_cookie()
wp-includes/pluggable.php 630
do_action( 'auth_cookie_expired', $cookie_elements );

Where the hook is used (in WP core)

wp-includes/default-filters.php 261
add_action( 'auth_cookie_expired', 'rest_cookie_collect_status' );