I see Cribl Metrics hitting DevNull but every Route that could filter it to that is off. Why?

I see cribl metrics hitting devnull dest. So I turned off all the routes that have a filter capturing Cribl metrics and sending them to devnull. But after viewing the live data for the devnull destination I still see the metrics events. Why?

Looking at the bottom of your screenshot, note the following message:

By default, any events that are not caught by a route filter are routed to the Default Destination, which is devnull. You will see this noted on the Routes page toward the bottom with the label endRoute.