# 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](https://developer.mediarithmics.io/advanced-usages/platform-monitoring/collection-volumes/..#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> |