genesis, zeke, linode, and exodus were missing shire-zebra.ts.net aliases in the genesis dnsmasq hosts file. Only hosea, isaiah, jeremiah, gitlab, matrix, chronicles, and nas1 had them. Since genesis is the DNS server for the whole network, Prometheus (and everything else) couldn't resolve those four hostnames, causing instant connection failures on scrape. Also update exodus Tailscale IP from 100.80.99.48 to 100.70.99.91 (stale IP in both network.json and the hosts file).