WordPress at a glance
action is not described

do_robotstxt action-hook . WP 2.1.0

Fires when displaying the robots.txt file.

Usage

add_action( 'do_robotstxt', 'action_function_name_5894' );
function action_function_name_5894(){
	// action...
}

Where the hook is called

do_robots()
wp-includes/functions.php 1322
do_action( 'do_robotstxt' );

Where the hook is used (in WP core)

Does not used.