<!-- source: https://secondlayer.tools/docs/api-reference#instance-metrics-object -->

## The Instance metrics object

Operational vitals.

| Field | Type | Description |
| --- | --- | --- |
| `uptime_s` | integer | Seconds since the API process started. |
| `db_size_bytes` | integer · nullable | Postgres database size, or `null` if it can't be read. |
| `deliveries_24h` | object · nullable | Webhook deliveries in the last 24 hours: `total`, `failed` (no status or 400+), and `dlq` (events currently dead-lettered). |
| `rows_series` | array of object | Rows processed across all subgraphs, per hour over the last 24 hours: `{ t, rows }`. |

```json
{
  "uptime_s": 86400,
  "db_size_bytes": 61203865600,
  "deliveries_24h": {
    "total": 460,
    "failed": 2,
    "dlq": 0
  },
  "rows_series": [
    {
      "t": "2026-09-23 13:00:00+00",
      "rows": 3202
    }
  ]
}
```