Override base method to log requests to JSON UDP collector and emit
        a metric.

def log_request(self, handler):
        """
        Override base method to log requests to JSON UDP collector and emit
        a metric.
        """
        packet = {'method': handler.request.method,
                  'uri': handler.request.uri,
                  'remote_ip': handler.request.remote_ip,
                  'status': handler.get_status(),
                  'request_time_ms': handler.request.request_time() * 1000.0,
                  'service_id': self.service_id,
                  'request_id': handler.request.headers.get(REQUEST_ID_HEADER,
                                                            'undefined')
                  }

        # handler can optionally define additional data to log
        if hasattr(handler, 'logvalues'):
            for key, value in handler.logvalues.iteritems():
                packet[key] = value

        servicelog.log(packet)

        metric = "requests." + str(handler.get_status())
        metrics.timing(metric, handler.request.request_time() * 1000.0)

        super(LoggingApplication, self).log_request(handler)