In London release, when SDNR moved to Strimzi Kafka from DMaaP MR, the consumerGroup name passed while creating the Kafka consumer is using the convention - 

<topic>-<consumerGroup>

  where <topic> is the Kafka topic name and <consumerGroup> is the kafka consumer group name specified in etc/mountpoint-registrar.properties)

As part of OOM changes, a different naming convention for consumerGroup is requested. The new consumerGroup name should be - 

<consumerGroup>-<topic>

Mountpoint-registrar bundle needs to be updated to provide the new naming convention requested for consumerGroup.