### Poll a session's counters

`GET /api/v1/admin/sessions/{id}/traffic`

The lightweight counter snapshot behind a live traffic graph. It is a snapshot, not a rate — derive throughput from the difference between two polls and the difference between their sampled_at stamps.

- Authentication: manager session (JWT) or API token
- Permission: `prm_report_sessions` (Sessions report)
- Risk: read

#### Parameters

| Name | In | Type | Required | Description |
| --- | --- | --- | --- | --- |
| `id` | path | integer | yes | Session id. |

#### Response — 200 OK

```json
{
  "data": {
    "id": 8821904,
    "session_time": 6900,
    "input_octets": 412000000,
    "output_octets": 5100000000,
    "update_time": "2026-09-20 09:06:02",
    "sampled_at": "2026-09-20 09:08:31"
  }
}
```

#### Note

update_time is when the NAS last reported, and sampled_at is when this server read it. They differ by up to one accounting interval, so two polls closer together than that interval return identical counters and a throughput of zero. That is the NAS being quiet, not the subscriber.