> ## Documentation Index
> Fetch the complete documentation index at: https://help.airbridge.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Get Metadata (Measurement Options)

Gets a list of available report measurement options. \[[Note](https://docs.google.com/spreadsheets/d/13ThNnryqRmZQwJVecM8lZ2OB7LzA8s3cwLlQBGpbXLg/edit?gid=1539494076#gid=1539494076)]

<Card title="Try API Request" icon="rectangle-api" horizontal href="https://www.postman.com/airbridge-engineering/airbridge-api/request/euwlhud/get-metadata-retention-types-copy" />

```text GET theme={"theme":{"light":"github-dark-dimmed","dark":"github-dark-dimmed"}}
https://api.airbridge.io/dataspec/v1/apps/{app_name}/retention-report/measurement_options
```

<h2 id="get-metadata-measurement-options-request">
  Request
</h2>

***

<h3 id="get-metadata-measurement-options-headers">
  Headers
</h3>

<ParamField header="Accept-Language" type="string">
  You can specify the language to use for API requests and responses. It follows the ISO-639-1 format.
</ParamField>

<ParamField header="Content-Type" type="string">
  Represents the media type of the resource. Defaults to `application/json`.
</ParamField>

<ParamField header="Authorization" type="string">
  The key value to use for API requests. Instructions for getting API keys are in "[how to generate API Keys](/en/references/introduction#authorization)".
</ParamField>

<h3 id="get-metadata-measurement-options-path-params">
  Path Params
</h3>

<ParamField path="app_name" type="string" required>
  Airbridge App Name. (Unique ID)
</ParamField>

<RequestExample>
  ```shellscript Request theme={"theme":{"light":"github-dark-dimmed","dark":"github-dark-dimmed"}}
  curl -X GET 'https://api.airbridge.io/dataspec/v1/apps/{app_name}/retention-report/measurement_options' \
    -H 'Accept-Language: ko' \
    -H 'Content-Type: application/json' \
    -H 'Authorization: Bearer {AIRBRIDGE-API-TOKEN}'
  ```
</RequestExample>

<h2 id="get-metadata-measurement-options-response">
  Response
</h2>

***

### 200

### 404

There is an error in the field provided, or there is no such resource.

<ResponseExample>
  ```json 200 theme={"theme":{"light":"github-dark-dimmed","dark":"github-dark-dimmed"}}
  {
    "data": [
      {
        "key": "general_retention",
        "name": "General",
        "description": "The user retention is measured based on all Start Events that occurred during the set date range. For example, the Return Event that occurred on 3/3 is attributed to both Channel A and B.  <br /><i>launch</i>\n<img src=\"https://static.airbridge.io/images/retention_measurement_tooltip_img/img_general.png\">\n<br /><i>launch</i>\n<a href=\"https://help.airbridge.io/en/guides/retention-report-viewing#general-mode\">Learn More</a>"
      },
      {
        "key": "confined_retention",
        "name": "Confined",
        "description": "The user retention is measured based on the latest Start Event that occurred during the set date range. For example, the Return Event that occurred on 3/3 is attributed to Channel B only. <br /><i>launch</i><img src=\"https://static.airbridge.io/images/retention_measurement_tooltip_img/img_confined.png\">\n<br /><i>launch</i>\n<a href=\"https://help.airbridge.io/en/guides/retention-report-viewing#confined-mode\">Learn More</a>"
      },
      {
        "key": "specific_retention",
        "name": "Specific",
        "description": "The user retention is measured based on the latest Start Event that occurred during the set date range. The Return Event is attributed when it occurs within the attribution window initiated by the Start Event. This option will be available soon. "
      }
    ]
  }
  ```

  ```json 404 theme={"theme":{"light":"github-dark-dimmed","dark":"github-dark-dimmed"}}
  {
    "type": "about:blank",
    "title": "Not Found",
    "status": 404,
    "traceId": "1-000000-000000000000000"
  }
  ```
</ResponseExample>