after removing a Rollout the referenced deployment from "workloadRef" keeps the entry "replicas: 0" if "scaleDown" is used

[Sven1410]

If a rollout resource is removed from the cluster the referenced deployment from "workloadRef" keeps the entry "replicas: 0" (if "scaleDown" is used). It will never scale up. This causes a service interruption.

use Case:

we use "scaleDown" in our rollout spec:

workloadRef:
  apiVersion: apps/v1
  kind: Deployment
  name: {{ .Release.Name }}
  scaleDown: onsuccess

we use this in a helm chart which allows to switch off the use of argo rollouts (and switch back to use the deployment directly). If we switch it off - the rollout resource is removed (by argo-cd). And the deployment stays with "replicas: 0" forever. We also use a hpa --> it ignores that state with "scaling is disabled since the replica count of the target is zero"

It would be great if the argo-rollouts controller can detect this and remove the "Replicas: 0" if a rollout is removed.

version of argo rollouts: 1.7.2

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