Yes, it can scale based on metrics. And metrics can be anything. What it’s missing is all the discovery and network plumbing to tie running instances together

Yes, it can scale based on metrics. And metrics can be anything. What it’s missing is all the discovery and network plumbing to tie running instances together with load balancing and inter-service comms. Googles old Borg paper mentions Condor as a thing they considered and cribbed features from. Honestly, serving a website is not as different from batch processing problems as you’d think. There are differences but they’re subtle, not mountainous.