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https://issues.apache.org/jira/browse/KUDU-3549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17814875#comment-17814875
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ASF subversion and git services commented on KUDU-3549:
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Commit 6b1c1eb0c97a2349e0b3fa098bf40f8147b43a60 in kudu's branch
refs/heads/master from Alexey Serbin
[ https://gitbox.apache.org/repos/asf?p=kudu.git;h=6b1c1eb0c ]
KUDU-3549 fix WriteAsPrometheus() for non-arithmetic gauges
This patch fixes WriteAsPrometheus() implementation for string-based
gauges. The original changelist that introduced Prometheus metrics
had a proper implementation of WriteAsPrometheus() only for StringGauge,
but any FunctionGauge for a non-arithmetic type (e.g., for std::string)
would still output a string value in Prometheus text format, and that
could not be consumed by Prometheus. The patch also contains a test
scenario that would fail without the fix.
This is a follow-up to 00efc6826ac9a1f5d10750296c7357790a041fec.
Change-Id: Ib7128f52729c7f984004811153a7eecc8ffe751b
Reviewed-on: http://gerrit.cloudera.org:8080/20990
Tested-by: Alexey Serbin <ale...@apache.org>
Reviewed-by: Marton Greber <greber...@gmail.com>
Reviewed-by: Attila Bukor <abu...@apache.org>
> String gauge exposed in prometheus format
> -----------------------------------------
>
> Key: KUDU-3549
> URL: https://issues.apache.org/jira/browse/KUDU-3549
> Project: Kudu
> Issue Type: Bug
> Components: metrics
> Affects Versions: 1.17.0
> Reporter: YUBI LEE
> Assignee: Alexey Serbin
> Priority: Major
>
> According to KUDU-3375, "Kudu now exposes all its metrics except for string
> gauges in Prometheus format via the embedded webserver's
> `/metrics_prometheus` endpoint".
>
> *
> [https://github.com/apache/kudu/blob/89e2715faf96afe0b67482166fda9c8699e8052f/docs/prior_release_notes.adoc?plain=1#L143-L145]
> * https://issues.apache.org/jira/browse/KUDU-3375
>
> However, with this commit
> ([https://github.com/apache/kudu/commit/e65ea38a4860c007d93ada9c991bccec903a80b1)]
> , string gauge related to clock_ntp_status is exposed.
>
> {code:java}
> # HELP kudu_master_clock_ntp_status Output of ntp_adjtime()/ntp_gettime()
> kernel API call
> # TYPE kudu_master_clock_ntp_status gauge
> kudu_master_clock_ntp_status{unit_type="state"} now:1706665936956760
> maxerror:70013 status:ok {code}
> It prevents prometheus operators from collecting prometheus metrics for kudu.
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