Azure resources can use either Classic (old) or ARM (new) APIs. Some of them can use either API, e.g. Virtual Machines, others use only one of them, e.g. Cloud Services use only Classic API. 

It’s necessary to determine which API is used in order to start monitoring Azure resources, as it determines how to authorize CloudMonix to access monitoring data.

An easy way to check which API a particular resource is using is to open the “All Resources” blade in Azure Portal. The resources using Classic API will have “(Classic)” suffix after resource name. If there’s no suffix, then the resource is using the ARM API.