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https://issues.apache.org/jira/browse/ZOOKEEPER-4818?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated ZOOKEEPER-4818:
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Labels: pull-request-available (was: )
> Export JVM heap metrics in ServerMetrics
> ----------------------------------------
>
> Key: ZOOKEEPER-4818
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4818
> Project: ZooKeeper
> Issue Type: Improvement
> Components: metric system
> Reporter: Andrew Kyle Purtell
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> A metric for JVM heap occupancy is not included in ServerMetrics.
> According to [https://zookeeper.apache.org/doc/current/zookeeperMonitor.html]
> the recommended practice is for someone to enable the
> PrometheusMetricsProvider and the Prometheus base class upon which that
> provider is based does export that information. See
> [https://zookeeper.apache.org/doc/current/zookeeperMonitor.html] . The
> example provided for alerting on heap utilization there is:
> {noformat}
> - alert: JvmMemoryFillingUp
> expr: jvm_memory_bytes_used / jvm_memory_bytes_max{area="heap"} > 0.8
> for: 5m
> labels:
> severity: warning
> annotations:
> summary: "JVM memory filling up (instance {{ $labels.instance }})"
> description: "JVM memory is filling up (> 80%)\n labels: {{ $labels }}
> value = {{ $value }}\n"
> {noformat}
> where {{jvm_memory_bytes_used}} and {{jvm_memory_bytes_max}} are provided by
> a Prometheus base class.
> Where PrometheusMetricsProvider is the right choice that's good enough but
> where the ServerMetrics information is consumed in an alternate way, by
> 4-letter-word scraping, or by JMX, ServerMetrics should provide the same
> information. {{jvm_memory_bytes_used}} and {{jvm_memory_bytes_max}}
> (presuming heap) are reasonable names. An alternative could be to calculate
> the heap occupancy and provide that as a percentage, either an integer in the
> range 0 - 100 or floating point value in the range 0.0 - 1.0.
> There is some precedent for exporting JVM metrics in ServerMetrics from
> ZOOKEEPER-3845 .
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