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https://issues.apache.org/jira/browse/KAFKA-19753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18024333#comment-18024333
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Charles-Eddy commented on KAFKA-19753:
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Hey you are right, it is not clear, but in our case if we put the same name and
tags, under the hood they are considered duplicates when registered and one of
them will be discarded. (like we want)
> Metrics from FetchMetricsManager containing a topic tag are duplicated
> ----------------------------------------------------------------------
>
> Key: KAFKA-19753
> URL: https://issues.apache.org/jira/browse/KAFKA-19753
> Project: Kafka
> Issue Type: Bug
> Components: consumer, metrics
> Affects Versions: 4.1.0
> Reporter: Charles-Eddy
> Priority: Minor
>
> Hello,
> Since Kafka 4.1.0, we're experiencing an issue with Kafka Streams metrics for
> topics containing dots in their names. (I think the problem is also for
> simple usage of consumers not only kstream)
> In FetchMetricsManager, methods like {{recordRecordsFetched()}} now create
> duplicate sensors for the same topic if they contain dot in their name:
> {code:java}
> void recordRecordsFetched(String topic, int records) {
> String name = topicRecordsFetchedMetricName(topic);
> maybeRecordDeprecatedRecordsFetched(name, topic, records); <-- here we
> create another sensor if the topic name contains dot
> Sensor recordsFetched = new SensorBuilder(metrics, name, () ->
> Map.of("topic", topic))
> .withAvg(metricsRegistry.topicRecordsPerRequestAvg)
> .withMeter(metricsRegistry.topicRecordsConsumedRate,
> metricsRegistry.topicRecordsConsumedTotal)
> .build();
> recordsFetched.record(records);
> } {code}
> It currently record two sensors, one with my original topic name, one time
> with a topic name with dots replaced by underscore.
> While we can work around this by reversing the transformation in our case
> (replacing underscores back to dots in Micrometer filters) or by removing
> this specific list of metrics, this does not feel like a long-term solution
> for us.
> Could a configuration option be added to disable the deprecated
> underscore-replaced metrics?
> Thanks in advance
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