When trying to create a new host, try to input a name , something like "host1".
Click 'submit'.
The system automatically adds a period (.) after "host1", so the name becomes "host1.",
and it displays this error: "must not include periods and is invalid"

1. If the system adds the period by itself, it should not fail as a wrong input.
2. It's not clear from user's point of view how to fix it if the system adds the period by itself. (and why this character is added anyway)
If a domain is needed, it should be clear from a message/tooltip that fqdn is expected as part of host name.
3. What means "and is invalid" - what else is wrong?

Please clarify the error message/make this flow more user friendly.
thank you