{@java.lang.String tag}
{#if tag}
    <script async src="https://www.googletagmanager.com/gtag/js?id=G-{tag}"></script>
    <script>
        window.dataLayer = window.dataLayer || [];
        function gtag()\{dataLayer.push(arguments);\}
        gtag('js', new Date());

        gtag('config', 'G-{tag}');
    </script>
{/if}