We are doing a phased roll out of the Scaling tab (and autoscaling) to all Render customers. It includes the ability to turn on CPU-based autoscaling for all eligible services, with memory-based autoscaling in the works.
We’ve also moved the Instances setting from the Settings tab to the Scaling tab; it is now available as Manual Scaling.
If you have any questions please post in the community or email firstname.lastname@example.org. Thank you!