You can now harden your IoT applications by configuring a back-up action to perform in the event your primary rule action(s) fail. Amazon IoT Rules Engine also attaches the error information to the message payload affected. You can use this feature to ensure that message data is handled in context of the error or routed to a back-up resource. Error Actions may be used to handle a range of user and service error conditions such as insufficiently provisioned downstream services, or unavailability of services.