arun kumar created HDDS-16019:
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Summary: 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
{{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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