[jira] [Closed] (JAMES-3405) Expose metrics over HTTP

["Benoit Tellier (Jira)" <se...@james.apache.org>]

     [ https://issues.apache.org/jira/browse/JAMES-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benoit Tellier closed JAMES-3405.
---------------------------------
    Resolution: Fixed

https://github.com/linagora/james-project/pull/3867 solved this

> 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
> This endpoint should require no authentication in order to be easily fetchable by prometheus.
> However as an admin, I need to explicitly enable it in the webadmin configuration, it is disabled by default.



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