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https://issues.apache.org/jira/browse/FLINK-27487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17909249#comment-17909249
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luoyuxia commented on FLINK-27487:
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Come from the email thread
https://www.mail-archive.com/user@flink.apache.org/msg47420.html
Will it cause the prometheus endpoint to return `curl: (52) Empty reply from
server`?
> KafkaMetricWrappers do incorrect cast
> -------------------------------------
>
> Key: FLINK-27487
> URL: https://issues.apache.org/jira/browse/FLINK-27487
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka, Runtime / Metrics
> Affects Versions: 1.15.0
> Reporter: Chesnay Schepler
> Assignee: Fabian Paul
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.15.1, 1.16.0
>
>
> In FLINK-24765 the kafka metric wrappers that bridge kafka metrics into our
> metric system were migrated from the deprecated {{KafkaMetric#value}} to
> {{#metricValue}}.
> This migration was done incorrectly. It was assumed that #metricValue behaves
> similar to #value in that it always returns a double, but this is not the
> case, as they may also return longs or strings.
> This results in these metrics throwing exceptions, which generally breaks the
> reporter mechanism completely.
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