Find historical node count of node pool

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We are running a Kubernetes cluster on AKS. The cluster runs on multiple node pools. Autoscaling is enabled to make sure nodes are added or removed when necessary.

I can see the current used amount of nodes by navigating to AKS -> Settings -> Node pools on the Azure Portal. However, I'm not able to get this information historically.

A question I want to find an answer for: How many nodes were active for node pool 'x' last night?

I couldn't find any metrics for the AKS and Virtual Machine Scale Set resources to answer my question. What are my options?

azure-vm-scale-set azure-aks kubernetes
1 Answers

AFAIK there is not such a metric. a small workaround could be:

In the Portal go to your AKS -> Monitoring -> Metrics. In the Scope select your AKS, Scope Namespace is Container service and then you have the following metrics:

  • Cluster Health - determines if the autoscaler will take action on the cluster

  • Unneeded Nodes - autoscaler mark nodes for deletion

There you can see at least if scaling took place and how many nodes were deleted afterwards so you could calculate the amount of nodes.

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