Merge pull request #283466 from mimckitt/patch-6

Update standby-pools-overview.md

Author: v-shils

articles/virtual-machine-scale-sets/standby-pools-overview.md

@@ -58,6 +58,63 @@ If the scale set reduces the instance count to 5, the standby pool would fill to
 
 - Max ready capacity (15) - Virtual Machine Scale Set instance count (5) = Standby pool size (10)
 
+## Standby pool instances
+When a virtual machine is in a standby pool, the `isVmInStandbyPool` parameter is set to true. When the virtual machine is moved from the pool instance the scale set, the parameter is automatically updated to false. This can be useful in determining when a virtual machine is ready to recieve traffic or not. 
+
+### [CLI](#tab/cli)
+
+```cli
+az vm get-instance-view --resource-group myResourceGroup --name myInstance
+
+    "extensions": null,
+    "hyperVGeneration": "V2",
+    "isVmInStandbyPool": true,
+    "maintenanceRedeployStatus": null,
+    "statuses": [
+      {
+        "code": "ProvisioningState/succeeded",
+        "displayStatus": "Provisioning succeeded",
+        "level": "Info",
+        "message": null,
+        "time": "2024-08-02T17:22:46.295536+00:00"
+      },
+      {
+        "code": "PowerState/deallocated",
+        "displayStatus": "VM deallocated",
+        "level": "Info",
+        "message": null,
+        "time": null
+      }
+    ],
+```
+
+### [REST](#tab/rest)
+
+```HTTP
+PUT https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/myResourceGroup/providers/Microsoft.Compute/virtualMachines/myInstance/instanceView?api-version=2024-03-01
+
+{
+  "bootDiagnostics": {},
+  "isVMInStandbyPool": true,
+  "hyperVGeneration": "V2",
+  "statuses": [
+    {
+      "code": "ProvisioningState/succeeded",
+      "level": "Info",
+      "displayStatus": "Provisioning succeeded",
+      "time": "2024-08-02T17:22:46.2955369+00:00"
+    },
+    {
+      "code": "PowerState/deallocated",
+      "level": "Info",
+      "displayStatus": "VM deallocated"
+    }
+  ]
+}
+```
+
+---
+
 
 ## Availability zones
 When using standby pools with a Virtual Machine Scale Set spanning [availability zones](virtual-machine-scale-sets-use-availability-zones.md), the instances in the pool will be spread across the same zones the Virtual Machine Scale Set is using.