Does LQ use Data Dag? And for what?

Today I noticed a pause while moving from a notification email to the corresponding post. Something called data dog was loading. I haven't noticed this before and it didn't happen with any of the other links. In fact, when I tried that particular notification again after five minutes, datadog did not load.

I DDG'd it and it seems to be a well recognised tracking and monitoring agency. What does LQ use it for?