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Remediation

Review Before Rightsizingโ€‹

Confirm 30-day and peak-period demand, autoscale rules, instance health, zone distribution, scheduled jobs, upgrade constraints, and the target capacity. Define a rollback plan before changing a production Scale Set.

Adjust Scale Set Capacityโ€‹

Azure portalโ€‹

  1. Open Virtual machine scale sets and select the Scale Set.
  2. Select Scaling.
  3. For autoscale, adjust the minimum, maximum, default capacity, and scale-in rules. For fixed capacity, reduce the instance count gradually.
  4. Verify application health, availability, and scaling behavior after each change.

Azure CLIโ€‹

For a fixed-capacity Scale Set, set the desired instance count:

az vmss scale \
    --resource-group "{{resource-group-name}}" \
    --name "{{scale-set-name}}" \
    --new-capacity "{{instance-count}}"

Right-Size the VM SKUโ€‹

If instance count is appropriate but capacity remains underused, evaluate a smaller compatible VM SKU in a non-production environment first. Apply the model change through a controlled rollout and confirm that the upgrade policy, image, extensions, disks, and networking remain compatible.

Considerationsโ€‹

  • Do not reduce autoscale minimum capacity below the availability requirement.
  • Review peak, batch, and seasonal demand; the policyโ€™s 30-day metrics may not represent every workload cycle.
  • Monitor workload health and capacity after each change, and restore the prior capacity if service-level objectives are affected.