Scaling Strategy

Design a scaling strategy for this workflow:

CURRENT LOAD:
[Current volume]

EXPECTED GROWTH:
[Projected increases]

SCALING STRATEGY:
{
  "current_capacity": {
    "items_per_hour": number,
    "concurrent_runs": number,
    "bottlenecks": ["list"]
  },
  "scaling_approach": {
    "horizontal": {
      "how": "description",
      "when_to_trigger": "condition",
      "limit": "max instances"
    },
    "vertical": {
      "how": "description",
      "options": ["upgrades available"]
    }
  },
  "auto_scaling_rules": [
    {
      "metric": "what to watch",
      "threshold": "when to scale",
      "action": "what to do"
    }
  ],
  "capacity_milestones": [
    {
      "volume": "X items/day",
      "changes_needed": ["list"],
      "estimated_cost": "$X"
    }
  ]
}