[jira] [Comment Edited] (KAFKA-14081) Cannot get my MetricsReporter implementation to receive meaningful metrics

["Gian Luca (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-14081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17579022#comment-17579022 ] 

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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