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https://issues.apache.org/jira/browse/FLINK-4206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15375377#comment-15375377
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ASF GitHub Bot commented on FLINK-4206:
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Github user rmetzger commented on the issue:
https://github.com/apache/flink/pull/2237
I stumbled across this and I found the limitation quite annoying, so if
there are no good reasons for the check, I agree to remove it.
Since @StephanEwen wrote this, it might be good if he could confirm.
> Metric names should allow special characters
> --------------------------------------------
>
> Key: FLINK-4206
> URL: https://issues.apache.org/jira/browse/FLINK-4206
> Project: Flink
> Issue Type: Improvement
> Components: Metrics
> Affects Versions: 1.1.0
> Reporter: Chesnay Schepler
> Assignee: Chesnay Schepler
> Fix For: 1.1.0
>
>
> Currently, the name of the metric is restricted to alphanumeric characters.
> This restriction was originally put in place to circumvent issues due to
> systems not supporting certain characters.
> However, this restriction does not make a lot of sense since for group names
> we don't enforce such a restriction.
> This also affects the integration of the Kafka metrics, so i suggest removing
> the restriction.
> From now on it will be the responsibility of the reporter to make sure that
> the metric identifier is supported by the external system.
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