but googling "google domain dynamic dns" provides a link to the support page I used)
Since it was not supported out of the box, I added a new entry for it in ddns_providers.conf with the URL template. I was able to create the entry, but then it fails to update saying it cannot retrieve the remote IP:
I checked the source code of ddns_gargoyle and the only thing I can think would fail here is the call to gethostbyname. An nslookup of the domain fails strangely: it prints an Address 1 with the remote IP address as expected but then fails and returns an error.Sun Sep 29 20:01:43 2019 daemon info ddns_gargoyle[1471]: remote IP cannot be determined
I can probably do some more digging around, but I wanted to know if google domains would be supported or not since OpenWRT claims support for it but it is not in the providers for Gargoyle.