Comment 3 for bug 1495388

@Mark, thanks for the comments. I think you are right, we can just leave the single character case alone. And the host update problem, I think you are right also, that isn't a problem.

@Eli, thanks for working with me on this.

Also the display_name = "-----", will lead to instance.hostname = ""

I think we should fix this.

My first idea is if the hostname become empty after strip invalid characters, we use "server [uuid]" instead of it.

But that still not good for non-english users. Maybe we can enable user to set hostname in the future with microversions