On Thu, 26 Mar 2020 at 12:03, marko <[email protected]> wrote:
> I'm having trouble with what seems to result from non-deterministic metric
> key generation occurring when using JMX export.
>
> Prior to upgrading our JVM version I'm receiving two metrics (ParNew and
> ConcurrentMarkSweep) under the following key:
> java_lang_GarbageCollector_CollectionCount
>
> Whereas after switching to a newer JVM version Prometheus generates two
> distinct metrics:
> java_lang_G1_Young_Generation_CollectionCount
> java_lang_G1_Old_Generation_CollectionCount
>
> Any ideas what's causing this and how can I make key generation
> deterministic?
>
> Below is an extract of what jmx_exporter outputs when I do a manual
> scraping.
> It looks like JMX bean property order affects metric key naming.
>
It does affect the default naming, however you shouldn't be relying on the
jmx exporter for any java.lang metrics - the agent will provide them itself.
Brian
>
> jmx_exporter % grep CollectionCount scrape1.txt
> java.lang{type=GarbageCollector, name=ParNew}[]CollectionCount: 10659
> java.lang{type=GarbageCollector,
> name=ConcurrentMarkSweep}[]CollectionCount: 24
>
> In Prometheus this results in java_lang_GarbageCollector_CollectionCount
>
> % grep CollectionCount scrape2.txt
> java.lang{name=G1 Young Generation,
> type=GarbageCollector}[]CollectionCount: 811
> java.lang{name=G1 Old Generation, type=GarbageCollector}[]CollectionCount:
> 0
>
>
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Brian Brazil
www.robustperception.io
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