Inject Google Analytics Tracker with Nginx

ga-nginx-template

server {
    # ...
    
    set $tracking_id 'UA-#########';
    sub_filter "</head>" "<script>(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');ga('create', '$tracking_id', 'auto');ga('send', 'pageview');</script></head>";
}