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).
root