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https://issues.apache.org/jira/browse/FLINK-4063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15327247#comment-15327247
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Aljoscha Krettek commented on FLINK-4063:
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User functions access metrics using {{RuntimeContext.getMetricGroup()}}.
> Add Metrics Support for Triggers
> --------------------------------
>
> Key: FLINK-4063
> URL: https://issues.apache.org/jira/browse/FLINK-4063
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Affects Versions: 1.1.0
> Reporter: Aljoscha Krettek
>
> Now that we have proper support for metrics we should also add a hook that
> allows triggers to report metrics.
> This supersedes FLINK-3758 which was about using accumulators for metrics in
> triggers.
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