autoscaling-policy.json

{
  "instance_min_count": 1,
  "instance_max_count": 4,
  "scaling_rules": [
    {
      "metric_type": "memoryutil",
      "breach_duration_secs": 60,
      "threshold": 30,
      "operator": "<",
      "cool_down_secs": 60,
      "adjustment": "-1"
    },
    {
      "metric_type": "memoryutil",
      "breach_duration_secs": 60,
      "threshold": 60,
      "operator": ">=",
      "cool_down_secs": 60,
      "adjustment": "+1"
    }
  ]
}