Name Resolution: Make the App Reach Its Backends by Name

myapp reaches three backends by name — db.internal, cache.internal, queue.internal — but name resolution for them is broken: one is pinned to the wrong address and two don't resolve at all. This host resolves those names from /etc/hosts; fix it so each name resolves to the address the network team published (see /root/brief.txt), and verify with getent hosts <name> — the same path the app's resolver uses.

Two traps: /etc/myapp/backends.conf mentions an old cache address — it's stale, use the authoritative value. And fix the wrong db.internal entry in place — an appended second line won't help, because the resolver returns the first match.