http://xmrhfasfg5suueegrnc4gsgyi2tyclcy5oz7f5drnrodmdtob6t2ioyd.onion/onion-services/setup/index.html
The hostname file in your Onion Service configuration directory contains the hostname for your new onion v3 service.
The other files are your Onion Service keys, so it is imperative that these are kept private.
If your keys leak, other people can impersonate your Onion Service, deeming it compromised, useless, and dangerous to visit.