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Azure Virtual Machines is one of several types of on-demand, scalable computing resources that Azure offers. An Azure virtual machine gives you the flexibility of virtualization without having to buy and maintain the physical hardware that runs the virtual machine.

Azure Virtual Machines lets you create and use virtual machines in the cloud. Providing what's known as Infrastructure as a Service (IaaS), virtual machine technology can be used in variety of ways. Some examples are:

Virtual machines (VMs) for development and test. Development groups commonly use VMs because they offer a quick, easy way to create a computer with specific configurations required to code and test an application. Azure Virtual Machines provides a straightforward and economical way to create these VMs, use them, then delete them when they're no longer needed.

Running applications in the cloud. It makes economic sense to run some applications in the public cloud. One example is an application that has large spikes in demand. Although you could equip your own data center with enough hardware to handle peak demand, that hardware might be underutilized much of the time. Running this application on Azure lets you pay for extra VMs only when you need them and shut them down when you don't. Or, suppose you're a start-up that needs on-demand computing resources quickly and with no commitment. Once again, Azure can be the right choice.

Extending your own datacenter into the public cloud. When you use Azure Virtual Network, your organization can create a virtual network (VNET) that's an extension of your own on-premises network and add VMs to that VNET. This allows running applications such as SharePoint, SQL Server and others on an Azure VM. This approach might be easier to deploy or less expensive than running them in VMs your own datacenter.

Disaster recovery. Rather than paying continuously for a backup datacenter that's rarely used, IaaS-based disaster recovery lets you pay for the computing resources you need only when you really need them. For example, if your primary datacenter goes down, you can create VMs running on Azure to run essential applications, then shut them down when they're no longer needed.

When multiple virtual machines are deployed through the Azure Resource Manager on the Azure cloud, administrators may often want to closely monitor the count of the VMs that are registered on the cloud and the VMs that were removed from the cloud. The AzrVmStatusTest test helps administrators in this regard.

This test auto-discovers the Azure subscriptions in a virtual environment and for each subscription, this test monitors the VMs that were deployed through the Azure Resource Manager and reports the numerical statistics of the VMs that were registered, added, removed, powered on and powered off etc.

The metrics of this test does not include the count of the virtual machines deployed using the Azure classic mode.

Outputs of the test : One set of results for each subscription subscribed on the target Microsoft Azure being monitored.

Measurement	Description	Measurement Unit	Interpretation
Registered_VMs	Indicates the number of virtual machines that were currently registered on this cloud.	Number	The detailed diagnosis of this measure if enabled, lists the names of the virtual machines, the location of the virtual machine, the Public IP address, the Internal IP address and the Operating system of the virtual machine.
Powered_ON_VMs	Indicates the number of virtual machines that are currently powered on.	Number	The detailed diagnosis of this measure lists the name of the virtual machine, the location of the virtual machine, the Public IP address, the Internal IP address and the Operating system of the virtual machine.
Powered_OFF_VMs	Indicates the number of virtual machines that are currently powered off.	Number	The detailed diagnosis of this measure lists the name of the virtual machine, the location of the virtual machine, the Public IP address, the Internal IP address and the Operating system of the virtual machine.
Added_VMs	Indicates the number of virtual machines that were newly added to the cloud during the last measurement period	Number	The detailed diagnosis of this measure lists the name of the virtual machine, the location of the virtual machine and the Operating system of the virtual machine.
Removed_VMs	Indicates the number of virtual machines that were removed from the cloud during the last measurement period.	Number	The detailed diagnosis of this measure lists the name of the virtual machine, the location of the virtual machine and the Operating system of the virtual machine.
Other_VMs	Indicates the number of virtual machines that were in disconnected or invalid or inaccessible state during the last measurement period.	Number	The detailed diagnosis of this measure lists the name of the virtual machine, the state of the virtual machine and the location of the virtual machine.