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https://issues.apache.org/jira/browse/KAFKA-14081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17579022#comment-17579022
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Gian Luca edited comment on KAFKA-14081 at 8/12/22 3:29 PM:
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Hi Rens and Bruno, thanks for the explanation, now I understand. If I had
looked at the JmxReporter before, then the function of {{metricChange()}} would
have been clear. I was under the impression that a reporter can stay up to date
about metrics and their values by simply listening to what is passed by
{{{}metricChange(){}}}, but I understand that it's slightly more complicated: a
reporter uses {{metricChange()}} only to discover metrics in the form of
KafkaMetric instances. It's then the reporter's responsibility to poll a
KafkaMetric object to get newer values.
I'll see if I can think of a different wording for the Javadoc of the method,
for now thanks for the help!
was (Author: JIRAUSER293007):
Hi Rens and Bruno, thanks for the explanation, now I understand. If I had
looked at the JmxReporter before, then the function of {{metricChange()}} would
have been clear. I was under the impression that a reporter can stay up to date
about metrics and their values by simply listening to what is passed by
{{{}metricChange(){}}}, but I understand that it's slightly more complicated: a
reporter uses {{metricChange()}} only to discover metrics in the form of
KafkaMetric instances. It's then the reporter's responsibility to poll a
KafkaMetric object to get newer values.
I'll if I can think of a different wording for the Javadoc of the method, for
now thanks for the help!
> Cannot get my MetricsReporter implementation to receive meaningful metrics
> --------------------------------------------------------------------------
>
> Key: KAFKA-14081
> URL: https://issues.apache.org/jira/browse/KAFKA-14081
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 3.3.0
> Reporter: Gian Luca
> Priority: Minor
>
> I want to extract metrics from KafkaProducer to export them to our company
> monitoring solution. At first I went for implementing {{MetricsReporter}} and
> registering my implementation through the "metric.reporters" config property.
> The class is correctly registered as it receives metric updates through
> {{metricChange()}} while KafkaProducer is being used. The problem is that all
> the metric values are stuck at zero (NaN in older versions of Kafka), even
> the most trivial (e.g. 'record-send-total').
> If instead of using a report I simply poll the {{metrics()}} method of the
> KafkaProducer, then I see meaningful values: counters increasing over time,
> etc.
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