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https://issues.apache.org/jira/browse/KAFKA-12469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17897282#comment-17897282
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Apoorv Mittal commented on KAFKA-12469:
---------------------------------------
This
[line|https://github.com/apache/kafka/blob/c92f16a727ebb44b0c44038fbfa254d425dffcae/clients/src/main/java/org/apache/kafka/clients/consumer/internals/FetchMetricsManager.java#L207]
causes the issue. Git blame shows the change from March-2023. I need to look
the older versions if it was always the case or this bug was introduced in
later versions.
May be we would require a KIP to correct this as as there might be some
existing metrics dasboard on these metrics tags which can break. I am assigning
the ticket to myself.
> 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
> Attachments: JConsole - Kafka Client.png
>
>
> 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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