In order to get the banner or logs, a greetings and galaxy-logs channels should be set respectively. I believe in giving the owner\admins all the rights to choose if they want the welcome banner or logs from the Galaxy bot or not. The channels can be created even after the bot is invited into the server.
Which server doesn't appreciate an additional member? Yep so does the Galaxy bot. The member is welcomed with a greetings DM and welcome banner which looks like this -
The artwork isn't owned by me, and General Ming's consent was taken for this image.
Logging plays an important role in moderation. For example, a member is kicked. This the log returned -
Detailed description of the action.