# List metric metadata

URL: https://docs.hanzo.ai/docs/openapi/o11y/get-o11y-metric-metric-metadata

> Serves the OLDER /metric/metric_metadata route.

`GET /v1/o11y/metric/metric_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/metric/metric_metadata` |
| **Method**    | `GET`                                                 |
| **Operation** | `get_o11y_metric_metric_metadata`                     |
| **Auth**      | `Authorization: Bearer $HANZO_API_KEY`                |

Serves the OLDER /metric/metric\_metadata route. It is
NOT the same op as metrics.go's metricMetadata (/metrics/metadata): different
path, different input (this one also scopes by service). Two slices named one
Go function for two routes; the route is the identity, so the name follows it.
Renamed rather than merged — collapsing them would silently drop the service
scope this one accepts.
It returns one metric's metadata — its type, unit, description,
temporality, monotonicity and histogram buckets — optionally scoped to the
metric as one service reports it.

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

## Request

2 fields.

| Field         | In    | Type   | Required | Description                                                              |
| ------------- | ----- | ------ | -------- | ------------------------------------------------------------------------ |
| `metricName`  | query | string | —        | MetricName is the metric to read.                                        |
| `serviceName` | query | string | —        | ServiceName scopes the metadata to the metric as one service reports it. |

## Response

| Status    | Body                       | Meaning           |
| --------- | -------------------------- | ----------------- |
| `200`     | o11y.O11yMetricMetadataOut | ok                |
| `202`     | Approval                   | held for approval |
| `default` | problem-details            | refused           |

`200` body — 7 fields.

| Field              | In   | Type                    | Always | Description                                          |
| ------------------ | ---- | ----------------------- | ------ | ---------------------------------------------------- |
| `data`             | body | o11y.O11yMetricMetadata | —      |                                                      |
| `data.description` | body | string                  | —      | Description describes the metric.                    |
| `data.isMonotonic` | body | boolean                 | —      | IsMonotonic marks a sum that only ever increases.    |
| `data.temporality` | body | string                  | —      | Temporality is delta or cumulative.                  |
| `data.type`        | body | string                  | —      | Type is the metric type, e.g. gauge, sum, histogram. |
| `data.unit`        | body | string                  | —      | Unit is the metric's unit.                           |
| `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 metric metric_metadata
```

**SDK**

**.ts**

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

const api = new O11yApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.getO11yMetricMetricMetadata();
```

**.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_o11y_metric_metric_metadata()
```

**.go**

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

resp, _, err := client.O11yAPI.GetO11yMetricMetricMetadata(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_o11y_metric_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).getO11yMetricMetricMetadata();
```

**HTTP**

```bash
curl https://api.hanzo.ai/v1/o11y/metric/metric_metadata \
  -H "Authorization: Bearer $HANZO_API_KEY"
```

**MCP**

Tool `o11y`, op `get_o11y_metric_metric_metadata` — 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": "get_o11y_metric_metric_metadata",
           "input": {}
         }
       }
     }'
```

---

[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)