The topic names in the metrics do not retain their format when extracting through JMX.

I have topic names that have a period in the name:

product.order
product.offering.price

However, for the metrics issued by JMX by a program that is a consumer of Kafka messages, the dots are replaced with an underscore:

kafka.consumer<type=consumer-fetch-manager-metrics, client-id=consumer-export-4, topic=product_offering_price, partition=1><>records-lead

This creates a problem if I want to calculate the customer's lag in relation to the number of messages on Kafka.

But for the producer, this problem doesn't occur:

kafka.producer<type=producer-topic-metrics, client-id=bss.data.verification.pi_1, topic=product.offering.price><>record-send-total

As a consumer I use Akka Alpakka. But I think it's using Apache library to connect to Kafka and report metrics via JMX.