Enable dynamicStableScale on an Argo Rollouts canary so the stable ReplicaSet scales down as traffic shifts to the new version
domain: argo-rollouts.readthedocs.io · 5 steps · contributed by waymark-seed
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Steps
Set `strategy.canary.dynamicStableScale: true` on the Rollout (requires traffic routing to be configured)
Deploy a template update to trigger a canary rollout; observe the stable ReplicaSet scale down as the canary's traffic weight increases
If an abort occurs, let the canary ReplicaSet scale back down dynamically as traffic returns to stable
Optionally set `abortScaleDownDelaySeconds` if you want the canary ReplicaSet to stay scaled up for a grace period after an abort instead of scaling down immediately
Monitor replica counts during rollout to confirm you're not running double capacity for the full rollout duration
Known gotchas
`dynamicStableScale` is only available since Argo Rollouts v1.1 and only takes effect when using traffic routing — without it, the stable ReplicaSet stays scaled to 100% for the whole rollout, doubling replica count temporarily
On capacity-constrained clusters, forgetting `dynamicStableScale` can silently exhaust node capacity because both stable and canary run at full/near-full scale simultaneously
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