WordPress at a glance
action is not described

pingback_post action-hook . WP 0.71

Fires after a post pingback has been sent.

Usage

add_action( 'pingback_post', 'action_function_name_9585' );
function action_function_name_9585( $comment_ID ){
	// action...
}
$comment_ID(int)
Comment ID.

Where the hook is called

wp_xmlrpc_server::pingback_ping()
pingback_post
wp-includes/class-wp-xmlrpc-server.php 6518
do_action( 'pingback_post', $comment_ID );

Where the hook is used (in WP core)

Does not used.