> For the complete documentation index, see [llms.txt](https://developer.mediarithmics.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.mediarithmics.io/advanced-usages/platform-monitoring/collection-volumes/dimensions-and-metrics.md).

# Dimensions and metrics

## Dimensions

The following dimensions can be requested in reports

| Name              | Title           | Description                                                                                                                                                               |
| ----------------- | --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `date_time`       | Date Time       | <p>The date and time of the datamart collection size computation in timestamp format. </p><p></p><p>Use it to know exactly when the collection volume was calculated.</p> |
| `community_id`    | Community ID    | The community on which the datamart is linked.                                                                                                                            |
| `organisation_id` | Organisation ID | The organisation on which the datamart is linked.                                                                                                                         |
| `collection`      | Collection      | The indexed datamart [Collection](/advanced-usages/platform-monitoring/collection-volumes.md#undefined).                                                                  |

## Metrics

The following metrics can be displayed in reports.

| Name    | Title | Description                                                                                                                                                                                                              |
| ------- | ----- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `count` | Count | <p>The number of elements indexed for a given datamart collection.<br><br><em>If you don't use the <code>date\_time</code> dimension, the result will be an average of all calculated values during the period.</em></p> |


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