Some services actually do need unrestricted DNS access, such as a fedi instance. However, that also allows them to map the local network via DNS requests.
Solution: create a CoreDNS instance for each of those namespaces that explicitly allows only the required local services plus external services. I'd need 2-3 of these tops, and they would use their node-local unbound as an upstream.
Adguard-dns would also use a node-local unbound when serving end user DNS requests.
@ithoughtisawa2 I have a dashboard that lists all the containers making disallowed DNS requests, and failed DNS requests, all but a small handful have a short list of specifically allowed DNS requests, and it lists which DNS instance the request was made to, kinda happy with how it turned out tbh
Homeassistant has one of the longest lists currently