WordPress at a glance
action is not described

trackback_post action-hook . WP 1.2.0

Fires after a trackback is added to a post.

Usage

add_action( 'trackback_post', 'action_function_name_3867' );
function action_function_name_3867( $trackback_id ){
	// action...
}
$trackback_id(int)
Trackback ID.

Where the hook is called

In file: /wp-trackback.php
trackback_post
wp-trackback.php 144
do_action( 'trackback_post', $trackback_id );

Where the hook is used (in WP core)

Does not used.