Hi Hiromi,
Thanks for reaching out to the Google Ads API Forum.
Yes, it is an intended change since V12 removed support for creating a new Gmail ad. You may need to use Discovery campaigns instead.
Also, yes, you will not be able to retrieve reporting metrics for your past GmailAd using ad.gmail_ad* from ad_group_ad report from Google Ads API V12 version. However, you may still be able to pull it via V11 before it is completely shutdown from the API. You may pull all your gmail ad related data on your end to have a local copy for your reference.
Regards,
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| Yasar |
| Google Ads API Team |
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