Title. We can't see any JS tracking code when opening developer tools, but we do see hits when looking at Google Analytics.
Topic on Extension talk:GTag
$wgGTagHonorDNT defaults to true, and a lot of browsers either default to or can be easily configured to sending the DNT: 1 header. If that config is true and the DNT header is present, no tracking js is generated. Additionally, if you're in a group with the gtag-exempt right, no tracking js is generated.