If the on-prem cluster is still running, disable Telemetry Reporter in both Kafka brokers.
docker-compose exec kafka1 kafka-configs \
--bootstrap-server kafka1:12091 \
--alter \
--entity-type brokers \
--entity-default \
--delete-config confluent.telemetry.enabled,confluent.telemetry.api.key,confluent.telemetry.api.secret