I've set the GA ID but I'm not seeing any hits in the Google Analytics Console
#Problem
I've set the Google Analytics ID on the configuration page, but when I view a page, it doesn't show up in the Google Analytics console
#Possible Solutions
#1. GA Property ID correctness
Please double check that the Google Analytics property ID you've set is correct. You can not use Google Tag Manager IDs, since that's a different system. Please also make sure that there is no hidden characters (such as a whitespace or newline) before or behind the ID.
#2. Google Tag Assistant
Use the Google Tag Assistant Chrome app from the Chrome Web Store to check if a beacon is being sent to Google: https://chrome.google.com/webstore/detail/tag-assistant-by-google/kejbdjndbnbjgmefkgdddjlbokphdefk?hl=en
Once installed, open the app from its icon on the Chrome menu bar and click enable and record
Then load a regular page on your Confluence instance
The error message "Invalid call to gtag(), the Global site snippet is not installed" is a false negative due to the unusual workaround we have to use to provide you with the functionality
#3. Errors in the browser's Javascript console
Check the browser console for any warnings related to the Google Analytics app. Open the Javascript console as described on https://wordpress.org/support/article/using-your-browser-to-diagnose-javascript-errors/#step-3-diagnosis and check for messages prefixed with "GA:"
If everything is configured properly, you should see something like this:

#Related articles
Read up on Do Not Track:
