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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def process_response(self, request, response):
 """ Add metrics for various details of the request. """

        self._set_request_auth_type_metric(request)
        self._set_request_user_agent_metrics(request)
        self._set_request_referer_metric(request)
        self._set_request_user_id_metric(request)

        return response