Recommendation widget, engagement
| Metric | Name | Description | Type | Filtering option | Minimum date for report generation | 
| 
 | Widget impressions | An impression is when a widget is shown to the page user. A widget impression is counted if at least one article was in the user's viewport for at least 2 seconds and in at least 50% of the cell. Built on the  | 
 | present | 2020-03-01 | 
| 
 | Article impressions | An impression is when an article in the widget is shown to the page user. An article impression is counted if at least 50% of the cell was in the user's viewport for at least 2 seconds. Built on the  | 
 | present | 2020-03-01 |