You can read the detailed blog post about how I built it.

MarkupGALite is a wrapper around ga-lite, a lightweight alternative to official Google Analytics client. It only includes pageview event. It's cacheable, and its small print allows it to be injected / linked into page without much load.

The module offers several features:

• A configuration page for:
  • Setting up tracking ID and IP anonymization
  • Specifying pages to inject the script
  • Choosing where to place the script (before </head> or </body>)
  • Choosing whether to link or inject complete script into HTML
• Hookable. By hooking MarkupGALite::renderTrackingCode, it's possible to change the rendered tracking code.
• Translatable. All strings are marked as translatable.

• Install the module from Modules > Install > Add New using one of the provided options. Or download and extract it to /site/modules/, then install.
• On the configuration page, fill in the tracking code (otherwise script will not be included in page), and any other options.

You can use it manually without installing.

$ga = wire()->modules->MarkupGALite;

echo $ga->renderTrackingCode([
    'trackingId' => 'UA-123XX',
    'anonymizeIp' => true
]);

You can hook into renderTrackingCode method.

• Change the arguments

  wire()->addHookBefore('MarkupGALite::renderTrackingCode', function(HookEvent $e){
      $options = $e->arguments(0);
      $inject = $e->arguments(1);
  
      $options['trackingId'] = 'UA-ANOTHER';
      $inject = false;
      
      $e->setArgument(0, $options);
      $e->setArgument(1, $inject);
  });

• Disable it altogether:

  wire()->addHookBefore('MarkupGALite::renderTrackingCode', function(HookEvent $e){
      // $someCondition = ...
      
      if ($someCondition) $e->cancelHooks = true;
  });