Ads. It's hard to make money in online news, so lots of sites feel the need to plaster ads all over the page. Every ad is going to bring along its own trackers to gather information on users but also to make sure the site is meeting guaranteed minimums for viewability.

Analytics. At a minimum, there's going to be Google Analytics but there might be some in-house tracking tool or some kind of audience statistics package too.

Paywalls need to make sure you haven't met the limit.

A/B tests on headlines, content, and even styling mean remembering which test group you fall into.