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https://issues.apache.org/jira/browse/SLING-12013?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Munteanu resolved SLING-12013.
-------------------------------------
Fix Version/s: (was: Commons Threads 3.3.0)
Resolution: Won't Fix
The problem was fixed more than 5 years ago in the prometheus Java client -
https://github.com/prometheus/client_java/commit/3a5cef6618d4f4e741d541c1c79b31fb0488d068
. I don't think this is worth fixing.
> Commons Threads exports invalid 'Pid' attribute as gauge
> --------------------------------------------------------
>
> Key: SLING-12013
> URL: https://issues.apache.org/jira/browse/SLING-12013
> Project: Sling
> Issue Type: Bug
> Components: Commons
> Reporter: Robert Munteanu
> Assignee: Robert Munteanu
> Priority: Major
>
> The commons.thread bundle exports its JMX attributes as Gauges via the
> [ThreadPoolMetricGauges
> class|https://github.com/apache/sling-org-apache-sling-commons-threads/blob/master/src/main/java/org/apache/sling/commons/threads/impl/ThreadPoolMetricsGauges.java].
> In particular, it also exports the 'Pid' attribute.
> This attribute does not make sense as a Gauge value ( it's a static,
> non-numeric, value ) and when exported ends up null.
> When used with the [prometheus bundle from the
> whiteboard|https://github.com/apache/sling-whiteboard/tree/master/metrics-prometheus]
> it breaks the Prometheus metrics servlet, causing no metrics to be returned.
> Note that this is the code provided by the Prometheus SimpleClient bundle, we
> can't influence how it behaves. I tried.
> {noformat}
> 29.08.2023 17:42:16.461 *ERROR* [FelixLogListener]
> LogService.org.apache.felix.http.jetty Exception while processing request to
> /metrics (java.lang.NullPointerException: Cannot invoke "Object.getClass()"
> because "obj" is null)
> java.lang.NullPointerException: Cannot invoke "Object.getClass()" because
> "obj" is null
> at
> io.prometheus.client.dropwizard.DropwizardExports.fromGauge(DropwizardExports.java:55)
> [io.prometheus.simpleclient_dropwizard:0.0.23]
> at
> io.prometheus.client.dropwizard.DropwizardExports.collect(DropwizardExports.java:133)
> [io.prometheus.simpleclient_dropwizard:0.0.23]
> at
> io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.findNextElement(CollectorRegistry.java:180)
> [io.prometheus.simpleclient:0.0.23]
> at
> io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.<init>(CollectorRegistry.java:144)
> [io.prometheus.simpleclient:0.0.23]
> at
> io.prometheus.client.CollectorRegistry.filteredMetricFamilySamples(CollectorRegistry.java:131)
> [io.prometheus.simpleclient:0.0.23]
> at
> io.prometheus.client.exporter.MetricsServlet.doGet(MetricsServlet.java:43)
> [io.prometheus.simpleclient_servlet:0.0.23]
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
> [org.apache.felix.http.servlet-api:1.2.0]
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
> [org.apache.felix.http.servlet-api:1.2.0]
> {noformat}
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