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https://issues.apache.org/jira/browse/KAFKA-3881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17732693#comment-17732693
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Kirk True commented on KAFKA-3881:
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We have a user running into this issue. It appears that only the
fetcher-related metrics are the metrics that preemptively convert {{.}} to
{{{}_{}}}.
My initial research lead me down the path to the fetcher metric names, which
looks to jive with the direction of [~tombentley] and [~dbrinegar]'s solutions
in their respective pull requests.
> Remove the replacing logic from "." to "_" in Fetcher
> -----------------------------------------------------
>
> Key: KAFKA-3881
> URL: https://issues.apache.org/jira/browse/KAFKA-3881
> Project: Kafka
> Issue Type: Bug
> Components: consumer, metrics
> Reporter: Guozhang Wang
> Assignee: Tom Bentley
> Priority: Major
> Labels: newbie, patch-available
>
> The logic of replacing "." to "_" in metrics names / tags was originally
> introduced in the core package's metrics since Graphite treats "." as
> hierarchy separators (see KAFKA-1902); for the client metrics, it is supposed
> that the GraphiteReported should take care of this itself rather than letting
> Kafka metrics to special handle for it. In addition, right now only consumer
> Fetcher had replace, but producer Sender does not have it actually.
> So we should consider removing this logic in the consumer Fetcher's metrics
> package. NOTE that this is a public API backward incompatible change.
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