I'm in the process of cleaning up our analytics tracking, and I've realised that one of the gaps we have is between the tracked links in our CiviMail mailings and Google Analytics.
The main thing we need to implement is to (remember to) use GA campaigns, but I also wanted to check whether there's anything I'm missing on the CiviCRM side.
One issue is that we have CiviCRM installed on a subdomain without any GA tracking - however, I'm not clear on why the CiviMail tracked links aren't registered by Google Analytics as referrals from the subdomain.
(It may be that there isn't anything I can about this from the CiviCRM and I just need to deal with it from the GA side - I'm happy to close the question if that's the case)