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https://issues.apache.org/jira/browse/HDDS-16019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-16019:
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Labels: pull-request-available (was: )
> Publish httpfs gateway metrics to Prometheus via /prom endpoint
> ---------------------------------------------------------------
>
> Key: HDDS-16019
> URL: https://issues.apache.org/jira/browse/HDDS-16019
> Project: Apache Ozone
> Issue Type: Improvement
> Reporter: arun kumar
> Assignee: arun kumar
> Priority: Major
> Labels: pull-request-available
>
> HttpFSServerWebServer builds an HttpServer2 directly rather than
> extending BaseHttpServer, so unlike OM, SCM, Datanode, S3 Gateway,
> and Recon it does not expose a /prom endpoint. As a result the
> metrics already registered on the httpfs JVM (e.g. HttpFSServerMetrics)
> cannot be scraped by Prometheus, and httpfs is absent from
> compose/ozone/prometheus.yml and from component-grouped Grafana
> dashboards.
>
> {{Proposed change:}}
> * Register a PrometheusMetricsSink and add the PrometheusServlet at
> /prom in HttpFSServerWebServer, following the pattern in
> BaseHttpServer (guarded by hdds.prometheus.endpoint.enabled).
> * Register the sink with DefaultMetricsSystem on start(), unregister
> on stop().
> * Ensure /prom respects the same authentication guarantees as the
> other services in secure mode (not exposed unauthenticated).
>
> Note: BaseHttpServer.PROMETHEUS_SINK is currently package-private;
> exposing /prom from the httpfs package needs either that constant
> made public or the wiring extracted into a shared helper. Open to
> either – will confirm on review.
>
> This is a prerequisite for HDDS-15858 (build info metrics + ZDU
> dashboard), which will add the httpfs scrape target and build info
> on top once /prom exists.
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