Viewabillity dropped

[BerendKemper]

Situation:

Our company had done an upgrade of prebid version at 4 september.

• Since 19 May untill 4 september we were running v9.38.0-pre and it was stable.
• since 4 september our team bundled gulp and upgrade to v10.9.0
• on 9 september our team bundled gulp and upgrade to v10.10.0
• Currently, 29 september, i see that the new latest version is v10.11.0

Our company is using googletag (Google Ad Manager) as adserver and prebid headerbidding.
Our team did not notice any problems while i was on holiday and i just returned today.

Complication:

On my return today i noticed in Google Ad Manager reports filtered by Headerbidding prebid only that:

1. The viewabillity metrics has dropped from 80% to below 20% on the whole network.
2. All bidders are equally affected, so the issue does not seem related to a specific bidder.
3. I am certain that the viewabillity drop is caused by prebid version upgrade.

Question:

@prebid @prebidjs-release

• Are you aware of any viewabillity issues since after v9.38.0-pre?
• Is it possible that the latest v10.11.0 has already taken care of viewabillity issues?
• Do you perhaps have any idea why our google ad manager viewabillity metrics have dropped?

[dgirardi]

This was reported in #13836; 10.11.0 shipped #13851 which attempts to fix it - but I can't positively confirm that it does yet (it fixes the related symptom reported in that issue, but I haven't had confirmation from someone with real world metrics).

A related PR, still unreleased, is #13789 which is more aggressive in reverting some of the changes from 10 which we suspect are the culprit. It's currently also waiting for some real world testing.

[BerendKemper]

@dgirardi Thanks i will give v10.11.0 a try and i will let you know the results in a few days!

[BerendKemper]

@dgirardi
Warily, i'll share that the viewabillity seems to return to good levels.

I will share another update coming friday when more data is available.

[BerendKemper]

@dgirardi @patmmccann @prebid @prebidjs-release

Thanks for the guidance!
After upgrading to the latest Prebid.js version, the viewability issue has been resolved across the network.
From my end, this issue is now fixed — please feel free to close the ticket if there’s nothing further needed.

[dgirardi]

Than you very much for the follow up report!