Supports horizontal pod autoscaling (hpa) for backend and frontend pods:
- use cpu and memory averages
- adjust base memory + cpu for backend
- threshold set to 80% cpu and 95% memory utilization by default
(configurable in values.yaml)
- instead of backend and frontend replicas, set max replicas in
values.yaml
- only enable hpa if backend_max_replicas or frontend_max_replicas is
>1, default to 1 for now