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ad31e53287
A ring is used for the DNS code but slightly differently from the generic one, which prevents some important changes from being made to the generic code without breaking DNS. As the use cases differ, it's better to just split them apart for now and have the DNS code use its own ring that we rename dns_ring and let the generic code continue to live on its own. The unused parts such as CLI registration were dropped, resizing and allocation from a mapped area were dropped. dns_ring_detach_appctx() was kept despite not being used, so as to stay consistent with the comments that say it must be called, despite the DNS code explicitly mentioning that it skips it for now (i.e. this may change in the future). Hopefully after the generic rings are converted the DNS code can migrate back to them, though this is really not necessary.