plano/docs/source/_templates/analytics.html

<!-- _templates/analytics.html -->
{% if google_analytics_id %}
<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id={{ google_analytics_id }}"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());

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