hexo-theme-diaspora/layout/_partial/google-analytics.ejs

<% if (theme.google_analytics){ %>
    <!-- Global site tag (gtag.js) - Google Analytics -->
    <script async src="https://www.googletagmanager.com/gtag/js?id=UA-69833742-2"></script>
    <script>
      window.dataLayer = window.dataLayer || [];
      function gtag(){dataLayer.push(arguments);}
      gtag('js', new Date());

      gtag('config', '<%=theme.google_analytics%>');
    </script>
    <!-- End Google Analytics -->
<% } %>