Droplet naming and hostname advice

Hoping for some advice

Most of our droplets are for fairly small individual client websites, usually 1 droplet per website, but some droplets host more than one for the same client. None of these droplets send email directly, they all proxy through Mailgun. Most of the time, the floating IP of the droplet (and not the IP of the droplet itself) is used for public DNS records.

What should I be naming these droplets/hostnames? It doesn’t seem to make sense to make it the domain name and therefore a FQDN, since this will create a PTR which doesn’t seem to be relevant in this scenario. It also has nothing to do with the IP of the droplet itself.

Let’s say the purpose of a droplet is for hosting “example.com” and maybe “foo.example.com”. Maybe they’ll need a separate database server or another web server down the line.

What should the droplet be named?

example example.com example_web1 web01.prd.lon.example.com web01.prd.lon.mycompany.net example.web01.prd.lon.mycompany.net <some irrelevant name>

Thanks in advance Jamie