HON95-wiki/_includes/google_analytics.html

<!-- Global site tag (gtag.js) - Google Analytics -->
{% if site.google_analytics and jekyll.environment == 'production' %}
<script async src="https://www.googletagmanager.com/gtag/js?id={{ google_analytics }}"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());

  gtag('config', '{{ google_analytics }}');
</script>
{% endif %}