Policies are event triggers that monitor the activity of the system. Policies respond to predefined events issued by changes in the status or performance of specific vRealize Orchestrator objects.
Policies are a series of rules, gauges, thresholds, and event filters that run certain workflows or scripts when specific predefined events occur in vRealize Orchestrator or in the technologies that vRealize Orchestrator accesses through plug-ins. vRealize Orchestrator constantly evaluates the policy rules while the policy is running. For instance, you can implement policy gauges and thresholds that monitor the behavior of vCenter Server objects of the VC:HostSystem and VC:VirtualMachine types.