[jira] [Commented] (KAFKA-5890) records.lag should use tags for topic and partition rather than using metric name.

["Charly Molter (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-5890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16247837#comment-16247837 ] 

Charly Molter commented on KAFKA-5890:
--------------------------------------

Hey [~wushujames] I've finally got around to open a kip about this if you want to have a look: https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=74686649

> records.lag should use tags for topic and partition rather than using metric name.
> ----------------------------------------------------------------------------------
>
>                 Key: KAFKA-5890
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5890
>             Project: Kafka
>          Issue Type: Bug
>          Components: clients
>    Affects Versions: 0.10.2.0
>            Reporter: Charly Molter
>
> As part of KIP-92[1] a per partition lag metric was added.
> These metrics are really useful, however in the implementation  it was implemented as a prefix to the metric name: https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/consumer/internals/Fetcher.java#L1321-L1344
> Usually these kind of metrics use tags and the name is constant for all topics, partitions.
> We have a custom reporter which aggregates topics/partitions together to avoid explosion of the number of KPIs and this KPI doesn't support this as it doesn't have tags but a complex name.
> [1] https://cwiki.apache.org/confluence/display/KAFKA/KIP-92+-+Add+per+partition+lag+metrics+to+KafkaConsumer



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