Google Analytics

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$wgHooks['BeforePageDisplay'][] = function( OutputPage &$out, Skin &$skin ) {

    $code = <<<HTML

<script async src="https://www.googletagmanager.com/gtag/js?id=UA-151018458-1"></script> <script>

 window.dataLayer = window.dataLayer || [];
 function gtag(){dataLayer.push(arguments);}
 gtag('js', new Date());
 gtag('config', 'UA-151018458-1');

</script> HTML;

    $out->addHeadItem( 'gtag-insert', $code );
    return true;

};