The answer of the question depending on how you want to track each website in GA.
First off, since you have multiple configurations/databases, you'll need to setup GA (@ /admin/config/system/googleanalytics) on each the site if you're wanting to track each one, regardless how you track the sites in GA.
Next, if you're wanting to track each site separately in a different GA property (each with its own independent tracking metrics/dimensions/etc), you want to use the
A single domain (default) option with each site having a different
Web Property ID (e.g. UA-xxxxxxx-yy).
If you're wanting to track all these interrelated sites on one GA property, you'll need to use the
One domain with multiple subdomains option. You'll be using the
Web Property ID across all sites, but you'll have to make additional configurations to accommodate GA:
- If you're not using Universal Analytics, this means that the
$cookie_domain (in settings.php) needs to tweaked so that it reports to GA the same .mysite.com domain (this is what your linked d.o. is addressing).
- If you are using Universal Analytics, then just setting the
One domain with multiple subdomains option is fine.
Note, if you go with the
One domain with multiple subdomains option, you'll need to make some additional changes on the GA side so that filters show the domain. Otherwise, you're going to see various domain URLs mixed into the GA property.