Quick Trace:

#0 /usr/local/v3/Zend/Zend/Controller/Front.php(911)
     Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#1 /usr/local/v3/DocrootMedia/index.php(10)
     Zend_Controller_Front->dispatch()
#2 {main}

Detailed Trace

Array
(
    [0] => Array
        +(
            [file] => /usr/local/v3/Zend/Zend/Controller/Front.php
            [line] => 911
            [function] => dispatch
            [class] => Zend_Controller_Dispatcher_Standard
            [type] => ->
            [args] => Array
                +(
                    [0] => Zend_Controller_Request_Http Object
                        +(
                            [_requestUri:protected] => /robots.txt
                            [_baseUrl:protected] => 
                            [_basePath:protected] => 
                            [_pathInfo:protected] => /robots.txt
                            [_params:protected] => Array
                                +(
                                    [controller] => robots.txt
                                    [action] => index
                                    [module] => default
                                )

                            [_aliases:protected] => Array
                                +(
                                )

                            [_dispatched:protected] => 1
                            [_module:protected] => default
                            [_moduleKey:protected] => module
                            [_controller:protected] => robots.txt
                            [_controllerKey:protected] => controller
                            [_action:protected] => index
                            [_actionKey:protected] => action
                        )

                    [1] => Zend_Controller_Response_Http Object
                        +(
                            [_body:protected] => Array
                                +(
                                )

                            [_exceptions:protected] => Array
                                +(
                                )

                            [_headers:protected] => Array
                                +(
                                )

                            [_headersRaw:protected] => Array
                                +(
                                )

                            [_httpResponseCode:protected] => 200
                            [_isRedirect:protected] => 
                            [_renderExceptions:protected] => 
                            [headersSentThrowsException] => 1
                        )

                )

        )

    [1] => Array
        +(
            [file] => /usr/local/v3/DocrootMedia/index.php
            [line] => 10
            [function] => dispatch
            [class] => Zend_Controller_Front
            [type] => ->
            [args] => Array
                +(
                )

        )

)