Rollout for group of Deployment

[matiasah]

Summary

It would be useful if Argo Rollouts was able to handle a group of Deployment objects, or have a separate custom resource to handle different variations of a Deployment.
Currently the Rollout resource only handles ReplicaSets that matches only one Deployment object, but different implementations could vary in nodeSelector / nodeAffinity.

Use Cases

In Google Kubernetes Engine, it's possible to save costs by using dual deployments of standard and spot virtual machines. Spot VMs are cheaper and can be used in greater numbers to increase compute capacity at low cost.

• A Kubernetes Service is going to be pointing at all times to two different ReplicaSet resources (one spot, one standard).
• The dual ReplicaSets resources are going to have the same images, volumes, labels, etc.
• The dual ReplicaSets are going to differ in nodeAffinity / nodeSelector labels, as one is going to match specifically spot VMs while the other is going to use standard VMs.