curl --request GET \
  --url https://playflow.dev/api/api/v3/servers/{instance_id}/metrics \
  --header 'api-key: <api-key>'

{
  "instance_id": "<string>",
  "machine_id": "<string>",
  "region": "<string>",
  "period": {
    "start": 123,
    "end": 123,
    "step": "<string>"
  },
  "cpu": {
    "usage_percent": [
      {
        "t": 123,
        "v": 123
      }
    ]
  },
  "memory": {
    "used_mb": [
      {
        "t": 123,
        "v": 123
      }
    ],
    "total_mb": 123
  },
  "network": {
    "rx_bytes_per_sec": [
      {
        "t": 123,
        "v": 123
      }
    ],
    "tx_bytes_per_sec": [
      {
        "t": 123,
        "v": 123
      }
    ]
  },
  "load": {
    "average_1m": [
      {
        "t": 123,
        "v": 123
      }
    ]
  },
  "connections": {
    "tcp": [
      {
        "t": 123,
        "v": 123
      }
    ]
  }
}