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Export Druid metrics and build a grafana dashboard
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As far as I can see we use jmxtrans on druid nodes only for Zookeeper metrics, not for any Druid ones.

JMX Ports are already opened (just updated but from it seems that we'd have two options:

  1. build a prometheus druid metrics exporter (polling druid's http api periodically)
  2. export only jmx jvm metrics via jmxtrans or prometheus-jmx-exporter

I'd be in favor of having a complete dashboard with Druid metrics.