Thanks for your reply, Brenden.
I'm running version 8.0.19 with some customizations. This site used to run on a classic web host and has been migrated to Azure - so the database has some history, if that matters.
I've applied the fix and verified that it ran. The CMS_WebFarmServerTask table is still being queried constantly. I checked the table and it's empty. The idle load of these queries is generating about 40% utilization on the database. Again, that's with no traffic on the site whatsoever - it's run that query about 6.5 million times in the last day or so.
Any other ideas?