control runs VictoriaMetrics (loopback) and Grafana; every machine exports
node metrics and the nameservers export Knot stats (mod-stats + knot-exporter).
Scraping and the Grafana UI ride the ZeroTier mesh only, scoped by nftables to
the mesh /88; the public side stays closed by the Hetzner cloud firewall. The
provisioned DNS dashboard includes a per-zone SOA serial table to catch
primary/secondary drift. ZeroTier ULAs are centralised in mesh-hosts.nix.
Berwn
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