curl --request PUT \
  --url https://{host}/systems/{id}/attributes \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '[
  {
    "name": "Observed Uptime",
    "value": "0.33"
  },
  {
    "name": "Cost",
    "value": "17"
  }
]'

{
  "id": "<string>",
  "name": "<string>",
  "href": "<string>",
  "resource_id": "<string>",
  "type": "host",
  "platform": "VMWARE",
  "platform_model": "<string>",
  "total_physical_cpus": "<string>",
  "total_logical_cpus": "<string>",
  "cores_per_cpu": "<string>",
  "threads_per_core": "<string>",
  "memory": "<string>",
  "parent": "<string>",
  "children": "<string>",
  "manufacturer": "<string>",
  "os": "<string>",
  "os_patch_level": "<string>",
  "os_version": "<string>",
  "ip_address": "<string>",
  "mac_address": "<string>",
  "entity_role_name": "<string>",
  "entity_type": "<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": "CINT2000",
      "score_type": "cint2000",
      "value": 123
    }
  ],
  "I/O_benchmarks": [
    {
      "name": "Maximum Disk Throughput (bytes/s)",
      "score_type": "disk",
      "value": 123
    }
  ],
  "attributes": [
    {
      "id": "<string>",
      "name": "<string>",
      "value": "<string>"
    }
  ]
}