What does it listen on?

Local-only listeners should bind to loopback or a private interface. Public listeners should be intentional, documented, and covered by the firewall. A quick socket listing often reveals more than a configuration file search.

What user does it run as?

There is rarely a good reason for a static site or a metrics endpoint to run as root. A dedicated account, a read-only content directory, and a narrow working directory make mistakes less expensive.

What happens after a restart?

The unit should have a clear dependency order, a bounded restart policy, and logs that explain the first failure. Restarting forever is not recovery; it can hide a broken configuration and fill a disk.

Can it be updated safely?

Pinning a known-good version, keeping a small change record, and testing configuration syntax before restarting are inexpensive safeguards. I prefer a reversible deployment directory over editing files in place.

Can I remove it later?

An installation note should say where files, users, sockets, and systemd units live. Clean removal is a useful test of whether the original installation was understood.