Bulk swap of the old docker-2 host IP to the new one across 4 zones. docker-2.supported.systems intentionally preserved at the old IP — 6 CNAMEs depend on the FQDN; the old box keeps its identity until decommissioned.
Description
Hidden-primary DNS for ~91 zones: CoreDNS + custom rfc2136 plugin for self-hosted ACME DNS-01. Source of truth for zones/, Corefile, deploy configs.
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