perf/go/frontend/googleanalytics.html

{%- if not (eq .GoogleAnalyticsMeasurementID "") %}
<script async type="text/javascript" charset="utf-8" nonce="{% .Nonce %}"
    src="https://www.googletagmanager.com/gtag/js?id={% .GoogleAnalyticsMeasurementID %}">
</script>
<script type="text/javascript" charset="utf-8" nonce="{% .Nonce %}">
    window.dataLayer = window.dataLayer || [];
    function gtag(){dataLayer.push(arguments);}
    gtag('js', new Date());
    gtag('config', '{% .GoogleAnalyticsMeasurementID %}');
</script>
 {% end -%}