Google Analytics tags

Check that _config.yml contains:

ga_tracking: UA-2709176-10,G-5FG1HLH3XQ
ga_tracking_anonymize_ip: true

Build this site.

Check that the <head> of _site/index.html contains the following:

<script async src="https://www.googletagmanager.com/gtag/js?id=UA-2709176-10"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());
    gtag('config', 'UA-2709176-10', { 'anonymize_ip': true });
    gtag('config', 'G-5FG1HLH3XQ', { 'anonymize_ip': true });
</script>

Comment-out ga_tracking from _config.yml.
Build this site.
Check that the <head> of _site/index.html does not contain any GA tags.
Restore ga_tracking in _config.yml.