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https://issues.apache.org/jira/browse/NIFI-7378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17089735#comment-17089735
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ASF subversion and git services commented on NIFI-7378:
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Commit cd10435b9fa5ab180c80ef5c04069971b32b0fa9 in nifi's branch
refs/heads/master from Matt Burgess
[ https://gitbox.apache.org/repos/asf?p=nifi.git;h=cd10435 ]
NIFI-7378: Ensure label values are not null in Prometheus metrics (#4219)
> Prometheus components give error when null labels are provided
> --------------------------------------------------------------
>
> Key: NIFI-7378
> URL: https://issues.apache.org/jira/browse/NIFI-7378
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Reporter: Matt Burgess
> Assignee: Matt Burgess
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> It is possible for some components that a field used as a label in the
> metrics will have a null value. In that case the scraping fails and thus no
> metrics are available.
> The code should be defensive in the sense of setting a default value for all
> null labels.
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