WDQS Kafka Poller has been enabled first at part of T188252. It was disabled after some mirroring issues between kafka-main and kafka-jumbo. I tried to re-enable it this morning, but we had a different mirroring issue. WDQS is now back on the RC updater, and works fine.
We should re-enable the kafka poller, but only after the different mirroring issues are solved (I'm not entirely clear what those are, but @elukey will document them in a ticket, which we'll link from here).