[jira] [Commented] (ZOOKEEPER-3929) prometheus metrics with type "summary" always show quantiles as NaN

["maoling (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-3929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17198083#comment-17198083 ] 

maoling commented on ZOOKEEPER-3929:
------------------------------------

[~Slach]  

I also found this issue for a long time but too lazy to dig into it.

Let's me deep dive into it!

> prometheus metrics with type "summary" always show quantiles as NaN
> -------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-3929
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3929
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: metric system
>    Affects Versions: 3.6.0, 3.6.1
>            Reporter: Eugene Klimov
>            Priority: Major
>
> I run the following command on fresh installed Zookeeper:
> {code:java}
> wget -O- -q http://127.0.0.1:7000/metrics | grep -i readlatency{code}
> and got the following results:
> {code:java}
> # HELP readlatency readlatency
> # TYPE readlatency summary
> readlatency{quantile="0.5",} NaN
> readlatency{quantile="0.9",} NaN
> readlatency{quantile="0.99",} NaN
> readlatency_count 220.0
> readlatency_sum 330.0
> {code}
> look like quantiles don't calculate properly



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