WordPress at a glance
action is not described

do_robots action-hook . WP 2.1.0

Fired when the template loader determines a robots.txt request.

Usage

add_action( 'do_robots', 'action_function_name_3593' );
function action_function_name_3593(){
	// action...
}

Where the hook is called

In file: /wp-includes/template-loader.php
do_robots
wp-includes/template-loader.php 34
do_action( 'do_robots' );

Where the hook is used (in WP core)

wp-includes/default-filters.php 326
add_action( 'do_robots', 'do_robots' );