KQL 查询以获取 VMSS 中的实例数

Question

I'm trying to create a query that gives me the number of instances running in Azure from scale sets.

I need to configure an alert for monitoring when the number of instances drops below 2 VMs. Unless anyone knows how to monitor VM Scale sets, how do you track heartbeat when you have VMs scaling up and down.

I have tried in Resource Graph Explorer and they're available under:

Resources
    | where type =~ 'Microsoft.Compute/virtualMachineScaleSets'
    | where name contains "-conto"
    | join kind=inner (ResourceContainers | where type=='microsoft.resources/subscriptions' | project SubName=name, subscriptionId) on subscriptionId
    | project VMMSName = name, RGName = resourceGroup, VMMSSKU = sku.name, VMMSCount = sku.capacity, SubName, SubID = subscriptionId

But I can't use the same query in Log analytics. When I do a query in log anaytics, which has the option to create an alert I don't get numbe rof instances, and I need to have a way to monitor the VMs.

Heartbeat
| where ResourceType contains "virtualmachinescaleset"

Any help would be greatly appreciated. Thanks in advance.

Answer 1

As of now as per the MSDOC we don't have any metrics to get the no. of VM Scale set instances down/up .

We can get the VM Scale Sets Performance metrics like (CPU/Disk/Memory/etc.,)

Refer here for more information

Thanks @ hey for the workaround which you have provided.

Workaround:

Install the Azure Monitor Agent in your all VM Scale Set.

Azure Monitor Agent will send the heartbeat by default. It will be added in an Azure Monitor .

Query to get no of VM Scale Set instances from heartbeats.

 InsightsMetrics | where Namespace == "Computer" | where Origin =="vm.azm.ms/map" | where Name == "Heartbeat" | summarize Hb_count = count() by bin(TimeGenerated, 10m), Computer | extend alive=iff(Hb_count > 2, 1.0, 0.0) //computer considered "down" if it has 2 or fewer heartbeats in 10 min interval | where alive == true | project TimeGenerated, alive, Computer | summarize Hb_alive_count = count() by bin(TimeGenerated, 10m), alive | project TimeGenerated, Hb_alive_count | render timechart