# Create metadata

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

> Updates one metric's metadata — description, type, unit, temporality, monotonicity — and answers with the bare success envelope.

`POST /v1/o11y/metrics/metadata`

> [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/metrics/metadata` |
| **Method**    | `POST`                                          |
| **Operation** | `UpdateMetricMetadata`                          |
| **Auth**      | `Authorization: Bearer $HANZO_API_KEY`          |

Updates one metric's metadata — description, type, unit,
temporality, monotonicity — and answers with the bare success envelope.

## Request

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

| Field         | In   | Type    | Required | Description                                          |
| ------------- | ---- | ------- | -------- | ---------------------------------------------------- |
| `description` | body | string  | —        | Description describes the metric.                    |
| `isMonotonic` | body | boolean | —        | IsMonotonic marks a sum that only ever increases.    |
| `metricName`  | body | string  | yes      | MetricName is the metric to update.                  |
| `temporality` | body | string  | —        | Temporality is delta or cumulative.                  |
| `type`        | body | string  | —        | Type is the metric type, e.g. gauge, sum, histogram. |
| `unit`        | body | string  | —        | Unit is the metric's unit.                           |

## Response

| Status    | Body                  | Meaning           |
| --------- | --------------------- | ----------------- |
| `200`     | o11y.O11yMetricAckOut | ok                |
| `202`     | Approval              | held for approval |
| `default` | problem-details       | refused           |

`200` body — 1 field.

| Field    | In   | Type   | Always | Description          |
| -------- | ---- | ------ | ------ | -------------------- |
| `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 metrics metadata create --metric-name <metricName>
```

**SDK**

**.ts**

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

const api = new O11yApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.updateMetricMetadata({ metricName: "<metricName>" });
```

**.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).update_metric_metadata(metric_name="<metricName>")
```

**.go**

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

resp, _, err := client.O11yAPI.UpdateMetricMetadata(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::update_metric_metadata(&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).updateMetricMetadata();
```

**HTTP**

```bash
curl -X POST https://api.hanzo.ai/v1/o11y/metrics/metadata \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "metricName": "<metricName>"
     }'
```

**MCP**

Tool `o11y`, op `UpdateMetricMetadata` — 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": "UpdateMetricMetadata",
           "input": {
             "metricName": "<metricName>"
           }
         }
       }
     }'
```

---

[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)