This will only work in tests -- you want ``self.im.metrics`` (which is an instance of http://vumi-jssandbox-toolkit.readthedocs.org/en/release-0.2.x/metrics.html#MetricStore) or ``self.im.api_request`` (http://vumi-jssandbox-toolkit.readthedocs.org/en/release-0.2.x/interaction_machine.html#InteractionMachine.api_request) if you want to do lower-level API calls.