Payload of monitor is too large

Another question here - I’m trying to monitor the latest article that arrives at this URL:

It’s always the top left article. However, I haven’t been able to figure out a selection that isn’t article-specific (e.g., if I just select the CSS element in the top left, it is anchored to that specific article rather than the area) so I’ve ended up needing to monitor the entire page. This is causing an issue for my alerting, as I forward the Distil emails to a Teams channel and the payload of the email is too large.

Curious if you have any advice on how to properly set up a monitor here to only check for new articles that appear in the upper left of the page?

article:first-child should work.