Events not balanced across partitions when using opennms-kafka-producer

While trying to integration with the Kafka producer in a client environment, we found that events in the partitions are not being properly balanced:

I suspect this is due to the fact that we use the eventUei as the partition key, perhaps we can add different modes i.e. eventUei, node id, or random (based on event payload).

The customer also reported that the value of the create_time field is not being populated in the event.