Hi IMA team,
Innovid has been encountering cases of discrepancies with publishers utilizing the native IMA SDK or another player wrapping IMA SDK. In particular, we are running into discrepancies on the 'impression' event. Please see the below inline image (attached as well):

To explain, we are seeing each VPAID Event in the 'Event' column correspond with the following DFP pixel triggered by IMA. The video player tested on was Springboardvideo, wrapping HTML5 IMA SDK, linked here: <
http://goo.gl/fk81YO>.
The above results come from testing different JS VPAID ad units with the VPAID events suppressed from being sent to the player. For example, we no longer saw the 'vast_creativeview' DFP pixel fire when the ad unit suppressed sending the 'AdStart' VPAID event to the player.
Would you be able to look into and/or confirm the above? Additionally, could you please confirm which pixel is in charge of which metric (e.g. which label listed above corresponds with the 'start' metric in DFP reporting)? We are encountering discrepancies on 'impression' metrics, as the 'vast_creativeview' pixel which corresponds with the impression is not being fired alongside the 'AdImpression' VPAID event.
Please let us know any other information you need from us, or if you have any questions. We're happy to jump on a call if necessary or if you feel it would be beneficial.
Cheers,
Will Neville
Innovid Tier II Engineer