curl --request GET \
  --url https://api.example.com/cabinet/admin/remnawave/system \
  --header 'Authorization: Bearer <token>'

{
  "system": {
    "users_online": 123,
    "total_users": 123,
    "active_connections": 123,
    "nodes_online": 123,
    "users_last_day": 123,
    "users_last_week": 123,
    "users_never_online": 123,
    "total_user_traffic": 123
  },
  "users_by_status": {},
  "server_info": {
    "cpu_cores": 123,
    "cpu_physical_cores": 123,
    "memory_total": 123,
    "memory_used": 123,
    "memory_free": 123,
    "memory_available": 123,
    "uptime_seconds": 123
  },
  "bandwidth": {
    "realtime_download": 123,
    "realtime_upload": 123,
    "realtime_total": 123
  },
  "traffic_periods": {
    "last_2_days": {
      "current": 123,
      "previous": 123,
      "difference": "<string>"
    },
    "last_7_days": {
      "current": 123,
      "previous": 123,
      "difference": "<string>"
    },
    "last_30_days": {
      "current": 123,
      "previous": 123,
      "difference": "<string>"
    },
    "current_month": {
      "current": 123,
      "previous": 123,
      "difference": "<string>"
    },
    "current_year": {
      "current": 123,
      "previous": 123,
      "difference": "<string>"
    }
  },
  "nodes_realtime": [
    {}
  ],
  "nodes_weekly": [
    {}
  ],
  "last_updated": "2023-11-07T05:31:56Z"
}