Ad count

The Ad count metric reports the number of ads that started during a session. Use it to understand ad load by content, channel, or stream type. For ad start counts pivoted by ad dimensions (advertiser, campaign, creative), use the Ad starts metric available when the Ads variable category is enabled.

How this metric is calculated

The media backend increments mediaReporting.sessionDetails.adCount on every ad start event received during the session. The metric is reported on the close call.

Reporting system
Source
Adobe Analytics
Create a Processing rule that maps a.media.adCount to a custom event.
Customer Journey Analytics
mediaReporting.sessionDetails.adCount
Data feeds
event_list, post_event_list (the custom event that your processing rule maps a.media.adCount to; see event.tsv lookup)
Audience Manager
N/A
recommendation-more-help
media-analytics-help