curl --request GET \
  --url https://api.example.com/existing-systems \
  --header 'Authorization: Bearer <token>'

[
  {
    "id": "<string>",
    "name": "<string>",
    "href": "<string>",
    "type": "HOST",
    "platform_model": "<string>",
    "total_physical_cpus": "<string>",
    "cores_per_cpu": "<string>",
    "memory": "<string>",
    "total_logical_cpus": "<string>",
    "threads_per_core": "<string>",
    "cpu_speed": "<string>",
    "cpu_model": "<string>",
    "entity_type": "<string>",
    "entity_role_name": "<string>",
    "parent": "<string>",
    "children": "<string>",
    "os": "<string>",
    "os_version": "<string>",
    "os_patch_level": "<string>",
    "ip_address": "<string>",
    "mac_address": "<string>",
    "serial_number": "<string>",
    "hostId": "<string>",
    "control_environment": {
      "id": "<string>",
      "name": "<string>",
      "platform_category": "External Cloud",
      "href": "<string>",
      "icon": "<string>"
    },
    "infrastructure_group": {
      "id": "<string>",
      "name": "<string>",
      "href": "<string>"
    },
    "cpu_benchmarks": [
      {
        "name": "<string>",
        "score_type": "<string>",
        "value": 123
      }
    ],
    "I/O_benchmarks": [
      {
        "name": "<string>",
        "score_type": "<string>",
        "value": 123
      }
    ],
    "size": "<string>"
  }
]