This MAY be of interest. Thought I'd go ahead share some work doing with proxmox:
https://github.com/spinnaker/spinnaker/pull/7739
REMINDER that this is a work in progress. That said in testing I've already been able to do a fair bit. This would provide the ability to use spinnaker to do idempotent deploys of services to proxmox similar to EC2/K8s/other cloud providers. Spinnaker has always done a VERY good job of doing VM based deploys. This builds on that for proxmox (which I use in my lab). Though proxmox doesn't have "Autoscaling Groups" in the AWS sense, this can emulate this with manual operations of "add capacity". It's a WORK IN PROGRESS Very much initial, but with some testing it already enables:
* Load and display VMs in spinnaker for visualization of state
* Bake & deploy new operations (e.g. given an RPM, bake a new image with that PRM installed and deploy X number of VMs with that new baked image)
* Various "controls" to delete/scale said vms as needed

I plan to look at additional pieces - e.g. I've NOT done any pipeline stage work yet. I've got the bake & deploy of VMs working, caching of VMs and their state, basic deploys all working on my lab installation.