# Create aggregations

URL: https://docs.hanzo.ai/docs/openapi/o11y/gettraceaggregations

> Computes span aggregations over one trace — span count, duration or share of execution time — grouped by the resource field each aggregation names.

`POST /v1/o11y/traces/{traceId}/aggregations`

> [O11y →](https://docs.hanzo.ai/docs/openapi/o11y) · [All API references →](https://docs.hanzo.ai/docs/openapi) · [Get started →](https://docs.hanzo.ai/docs/guides)

|               |                                                              |
| ------------- | ------------------------------------------------------------ |
| **Address**   | `https://api.hanzo.ai/v1/o11y/traces/{traceId}/aggregations` |
| **Method**    | `POST`                                                       |
| **Operation** | `GetTraceAggregations`                                       |
| **Auth**      | `Authorization: Bearer $HANZO_API_KEY`                       |

Computes span aggregations over one trace — span count,
duration or share of execution time — grouped by the resource field each
aggregation names.

Callers need the viewer role; the runtime's own gate enforces it.

## Request

10 fields, body `application/json` (required).

| Field                                | In   | Type                    | Required | Description |
| ------------------------------------ | ---- | ----------------------- | -------- | ----------- |
| `traceId`                            | path | string                  | yes      |             |
| `aggregations`                       | body | o11y.SpanAggregation\[] | —        |             |
| `aggregations[].aggregation`         | body | any                     | —        |             |
| `aggregations[].field`               | body | o11y.TelemetryFieldKey  | —        |             |
| `aggregations[].field.description`   | body | string                  | —        |             |
| `aggregations[].field.fieldContext`  | body | any                     | —        |             |
| `aggregations[].field.fieldDataType` | body | any                     | —        |             |
| `aggregations[].field.name`          | body | string                  | yes      |             |
| `aggregations[].field.signal`        | body | any                     | —        |             |
| `aggregations[].field.unit`          | body | string                  | —        |             |

## Response

| Status    | Body                          | Meaning           |
| --------- | ----------------------------- | ----------------- |
| `200`     | o11y.O11yTraceAggregationsOut | ok                |
| `202`     | Approval                      | held for approval |
| `default` | problem-details               | refused           |

`200` body — 13 fields.

| Field                                     | In   | Type                           | Always | Description          |
| ----------------------------------------- | ---- | ------------------------------ | ------ | -------------------- |
| `data`                                    | body | o11y.GettableTraceAggregations | —      |                      |
| `data.aggregations`                       | body | o11y.SpanAggregationResult\[]  | —      |                      |
| `data.aggregations[].aggregation`         | body | any                            | —      |                      |
| `data.aggregations[].field`               | body | o11y.TelemetryFieldKey         | —      |                      |
| `data.aggregations[].field.description`   | body | string                         | —      |                      |
| `data.aggregations[].field.fieldContext`  | body | any                            | —      |                      |
| `data.aggregations[].field.fieldDataType` | body | any                            | —      |                      |
| `data.aggregations[].field.name`          | body | string                         | yes    |                      |
| `data.aggregations[].field.signal`        | body | any                            | —      |                      |
| `data.aggregations[].field.unit`          | body | string                         | —      |                      |
| `data.aggregations[].value`               | body | object                         | —      |                      |
| `data.aggregations[].value.*`             | body | integer (uint64)               | —      |                      |
| `status`                                  | body | string                         | —      | Status is "success". |

Failure carries the platform error shape — see [Errors](https://docs.hanzo.ai/docs/errors).

## Examples

**CLI**

```bash
hanzo o11y traces aggregations <traceId>
```

**SDK**

**.ts**

```ts
import { Configuration, O11yApi } from 'hanzoai';

const api = new O11yApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.getTraceAggregations({ traceId: 'traceId', aggregations: [{"aggregation":"<aggregation>","field":{"name":"<name>"}}] });
```

**.py**

```python
from hanzoai.cloud import ApiClient, Configuration
from hanzoai.cloud.api import O11yApi

client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"]))
result = O11yApi(client).get_trace_aggregations(trace_id='traceId', aggregations=[{"aggregation":"<aggregation>","field":{"name":"<name>"}}])
```

**.go**

```go
cfg := hanzoai.NewConfiguration()
cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY"))
client := hanzoai.NewAPIClient(cfg)

resp, _, err := client.O11yAPI.GetTraceAggregations(context.Background()).Execute()
if err != nil {
	return err
}
```

**.rs**

```rust
use hanzo_client::apis::{configuration::Configuration, o11y_api};

let mut cfg = Configuration::new();
cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok();

let result = o11y_api::get_trace_aggregations(&cfg, Default::default()).await?;
```

**.java**

```java
import ai.hanzo.cloud.ApiClient;
import ai.hanzo.cloud.api.O11yApi;

ApiClient client = new ApiClient();
client.setBearerToken(System.getenv("HANZO_API_KEY"));

var result = new O11yApi(client).getTraceAggregations();
```

**HTTP**

```bash
curl -X POST https://api.hanzo.ai/v1/o11y/traces/<traceId>/aggregations \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "aggregations": [
         {
           "aggregation": "<aggregation>",
           "field": {
             "name": "<name>"
           }
         }
       ]
     }'
```

**MCP**

Tool `o11y`, op `GetTraceAggregations` — POST the JSON-RPC envelope to `https://api.hanzo.ai/v1/mcp`.

```bash
curl -X POST https://api.hanzo.ai/v1/mcp \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "jsonrpc": "2.0",
       "id": 1,
       "method": "tools/call",
       "params": {
         "name": "o11y",
         "arguments": {
           "op": "GetTraceAggregations",
           "input": {
             "traceId": "<traceId>",
             "aggregations": [
               {
                 "aggregation": "<aggregation>",
                 "field": {
                   "name": "<name>"
                 }
               }
             ]
           }
         }
       }
     }'
```

---

[O11y API](https://docs.hanzo.ai/docs/openapi/o11y) · [All Hanzo APIs](https://docs.hanzo.ai/docs/openapi) · [Interactive reference](https://docs.hanzo.ai/docs/openapi/reference)