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https://issues.apache.org/jira/browse/JAMES-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17209889#comment-17209889
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Matthieu Baechler commented on JAMES-3405:
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Before implementing a pull-based metrics thing, just be aware that prometheus
is basically the only monitoring implementation doing that and that even at
google (which created prometheus in the first place) they dropped that concept
entirely.
> Expose metrics over HTTP
> ------------------------
>
> Key: JAMES-3405
> URL: https://issues.apache.org/jira/browse/JAMES-3405
> Project: James Server
> Issue Type: Improvement
> Components: guice, Metrics, webadmin
> Reporter: Benoit Tellier
> Priority: Major
> Fix For: 3.6.0
>
>
> = Why ?
> I want to export James metrics to prometheus.
> This modern metric stack relies on pulling (prometheus collects the metrics)
> instead of pushing.
> This need had been expressed by [~ieugen] here:
> https://github.com/ieugen/james-self-hosting-sandbox/issues/20
> = How ?
> With the https://github.com/prometheus/client_java dependency expose that as
> part of a `webadmin-metrics` Unauthentictated endpoint.
> Adapt content at
> https://github.com/prometheus/client_java/blob/master/simpleclient_servlet/src/main/java/io/prometheus/client/exporter/MetricsServlet.java
> Be aware that there is some conversion format to be done here:
> {code:java}
> CollectorRegistry collectorRegistry = CollectorRegistry.defaultRegistry;
> new DropwizardExports(environment.metrics()).register(collectorRegistry);
> new MetricsServlet(collectorRegistry)
> {code}
> Source
> https://stackoverflow.com/questions/53408121/which-metrics-are-exported-by-dropwizardmetrics-prometheus-client
> = Definition of done
> {code:java}
> As an admin,
> I have an HTTP endpoint
> Exposing metrics with the prometheus format
> {code}
> Scope: all guice products
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