Impression
An ad impression was recorded.
Properties
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For NativeAdPool events only: the NativeAdToken.tokenId of the specific leased ad this impression belongs to, or null if it cannot be resolved (the ad was already released, or this event came from a format with only one ad per controller, where attribution is unambiguous without an id). A NativeAdView bound to a different token must ignore an event whose adInstanceId doesn't match its own — see P1-8: without this, every row on a shared placement received every ad's events.
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The placement that produced this event, or null for global events.