Gatus with sqlite history, checking every public service plus its twin
s1.rubenhensen.nl on Hetzner. Replaces the GitHub-hosted Upptime page.
DNS gets s1 (Hetzner) and s2. s2 points straight at the home IP rather
than through the Hetzner tunnel, so it stays reachable when Hetzner is
down.
gatus/README.md explains how to read the two pages and writes down the
plan for a single self-hosted failover URL (PowerDNS LUA records).
