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https://issues.apache.org/jira/browse/KAFKA-19543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18010967#comment-18010967
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Kirk True commented on KAFKA-19543:
-----------------------------------
[~mjsax]—should the map returned from {{metrics()}} represent a _snapshot_ of
the metrics at the point in time it's called, or should it reflect _ongoing_
changes? The current behavior is the latter.
Because of KAFKA-19542, _some_ of the metrics are present in the Map,
post-{{close()}}, but not _all_, which is confusing to the user. So the fact
that metrics will be empty on {{close()}} should be documented in the API.
> The set of metrics returned from Consumer.metrics() changes after
> Consumer.close()
> ----------------------------------------------------------------------------------
>
> Key: KAFKA-19543
> URL: https://issues.apache.org/jira/browse/KAFKA-19543
> Project: Kafka
> Issue Type: Bug
> Components: clients, consumer, metrics
> Affects Versions: 4.1.0
> Reporter: Kirk True
> Assignee: Kirk True
> Priority: Minor
>
> metrics() reflects the current state, so if you get the metrics before you
> close and then look at them afterward, some of the metrics are missing
> because some were removed.
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