Add Kubernetes Pod Autoscaling

[xanderdunn]

Something like this:

apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
  name: my-app-hpa
  namespace: default
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: my-app
  minReplicas: 1
  maxReplicas: 10
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 50

[xanderdunn]

This will not be a great autoscaling strategy because we will often be bottlenecked on network requests rather than on CPU. Ultimately we would want to scale up if the number of transactions to process is large.