Hi,
Thank you for raising your concern to the Google Ads API team.
Kindly note that metrics.auction_insight are not publicly available for now. Since these metrics are not publicly available to the developers, what we can do is to advise you to wait until it opens for everyone.
In line with your concern, we've already submitted a request for this feature. With this, I would suggest keeping an eye on this blog and Release Notes, as we will post for such updates when they are made available to the public.
Let me know if you have any questions.
Reference links:
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Google Ads API Team |