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

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

Eugene Klimov created ZOOKEEPER-3929:
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             Summary: 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: 3.6.1, 3.6.0
            Reporter: Eugene Klimov


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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