You create provisioning and life cycle workflow subscriptions so that you can use vRealize Orchestrator to extend your management of IaaS machines. The provisioning subscriptions extend what you can do during the provisioning process. The life cycle subscriptions extend what you can do when the user is managing the provisioned items.
IaaS Service Integration
You create a workflow subscription based on a provisioning or life cycle event topic that runs a custom vRealize Orchestrator workflow based on a message generated by the IaaS service. vRealize Automation includes two event topics that you can use for IaaS integration.
Machine provisioning. Create workflow subscriptions that run workflows during the provisioning and disposal of IaaS machines.
Machine lifecycle. Create workflow subscriptions that run workflows related to management actions that an owning user runs on the provisioned machine.