Migrating to Rollouts with scaleDown and HPA

[sedflix]

We have HPA enabled using KEDA and are trying to start using Rollouts by Referencing Deployment From Rollout.

Setup:
The following happens when we try to enable Rollouts with

• "scaleDown" setting as "onsuccess" or even "progressively".
• We do not set "replicas" in the Rollout Spec due to this.

When using "progressively":

• Rollout starts spinning up 1 pod and terminating all the pods(except 1) in the Deployment.
• HPA fails with the HPA controller was unable to get the target's current scale: rollouts.argoproj.io "<>" not found
• After some time, HPA successfully triggers a scale operation. Rollout starts creating more pods (and it creates more pods in the Deployment following the scaleDown setting).

When using "onsuccess":

• Rollout starts spinning up 1 pod
• HPA fails with the HPA controller was unable to get the target's current scale: rollouts.argoproj.io "<>" not found
• After 1 pod is started successfully, it scales down all the previous pods. Therefore, we end up having only one 1 pod of the service.
• After some time, HPA successfully triggers a scale and things start getting back to normal.

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Is it possible for the "scaleDown" function to check the health of HPA before triggering any scale-down?