firehose connects to (micro) services (Thin WARs), gathers monitoring data and provides it in prometheus-compliant format. Lacking metadata can be provided via environment variables at docker start or via HTTP / JSON at runtime. New endpoints can be re-configured on-the-fly. One firehose instance can handle multiple endpoints. Firehose is a 16 kB Java EE 7, zero dependency, Thin WAR.Firehose and prometheus are going to be covered in Java EE Microservices / javaeemicro.services and Java EE Monitoring, Performance and Troubleshooting workshops.