curl --request GET \
  --url https://api.ubicloud.com/project/{project_id}/location/{location}/postgres/{postgres_database_reference}/servers \
  --header 'Authorization: Bearer <token>'

{
  "count": 123,
  "items": [
    {
      "id": "<string>",
      "role": "primary",
      "state": "running",
      "synchronization_status": "ready",
      "vm": {
        "id": "vmhfy8gff8c67hasb0eez2k1pd",
        "ip4": "127.0.0.1",
        "ip4_enabled": true,
        "ip6": "2606:4700:3108::ac42:2835",
        "location": "eu-central-h1",
        "name": "my-vm-name",
        "size": "<string>",
        "state": "<string>",
        "storage_size_gib": 123,
        "unix_user": "<string>"
      }
    }
  ]
}