WordPress at a glance
action is not described

deleted_site_transient action-hook . WP 3.0.0

Fires after a transient is deleted.

Usage

add_action( 'deleted_site_transient', 'action_function_name_2018' );
function action_function_name_2018( $transient ){
	// action...
}
$transient(string)
Deleted transient name.

Where the hook is called

delete_site_transient()
wp-includes/option.php 1645
do_action( 'deleted_site_transient', $transient );

Where the hook is used (in WP core)

Does not used.