WordPress at a glance
action is not described

clean_site_cache action-hook . WP 4.6.0

Fires immediately after a site has been removed from the object cache.


add_action( 'clean_site_cache', 'action_function_name_7191', 10, 3 );
function action_function_name_7191( $id, $blog, $domain_path_key ){
	// action...
Blog ID.
Site object.
md5 hash of domain and path.

Where the hook is called

wp-includes/ms-site.php 1009
do_action( 'clean_site_cache', $blog_id, $blog, $domain_path_key );

Where the hook is used (in WP core)

Does not used.