[jira] [Commented] (KAFKA-12469) The topic names in the metrics do not retain their format when extracting through JMX.

["Rotem Adhoh (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-12469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17552040#comment-17552040 ] 

Rotem Adhoh commented on KAFKA-12469:
-------------------------------------

We're hitting this bug as well when exporting JMX metrics from Kafka Connect workers (version 3.0.0)

> The topic names in the metrics do not retain their format when extracting through JMX.
> --------------------------------------------------------------------------------------
>
>                 Key: KAFKA-12469
>                 URL: https://issues.apache.org/jira/browse/KAFKA-12469
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer, metrics
>            Reporter: Rafał Chmielewski
>            Priority: Major
>
> 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.



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