| Key | Field | Type | Description | Requiredness | Default value |
| 1 | slot | string | The name of the ad slot in which this ad was rendered.
| required | |
| 2 | lineItemId | i64 | The DFP line item id populated in this slot.
| optional | |
| 3 | creativeId | i64 | The DFP creative id populated in this slot.
| optional | |
| 4 | timeToRenderEndedMs | i64 | The approximate amount of time (in milliseconds) that this
ad took to render.
| optional | |
| 5 | timeToAdRequestMs | i64 | The approximate amount of time (in milliseconds) that elapsed
before this ad was requested.
| optional | |
| 6 | adRetrievalTimeMs | i64 | The approximate amount of time (in milliseconds) between requesting
and receiving this ad.
| optional | |
| 7 | adRenderTimeMs | i64 | The approximate amount of time (in milliseconds) between receiving
and rendering this ad.
| optional | |