By default, the Quarkus services expose the metrics endpoint in localhost:8000/q/metrics where 8000 is the server port.
However, the Clowder enviroment expects the endpoint to be on localhost:9000/metrics where 9000 is the "metricsPort" property and "/metrics" is the "metricsPath" property in the clowder config file. Example:

{
"kafka": {
 "brokers": [
   {
     "hostname": "localhost",
     "port": 9092
   }
 ],
 "topics": []
},
"metricsPath": "/metrics",
"metricsPort": 9000,
"privatePort": 10000,
"publicPort": 8000,
"webPort": 8000
}

So far, we had a custom ServiceMonitor for Quarkus to redirect from "localhost:8000/q/metrics" to "localhost:9000/metrics". This ServiceMonitor only works in the prod and stage environments, and for the pods with a label "prometheus: quarkus".

The problem is that when porting services from Spring Boot to Quarkus, we can't modify the label (are immutable). This is a known limitation that is meant to be eventually fixed by RHCLOUD-30608.

Moreover, we can't dinamically configure the metrics path because these are managed by build-time properties.

Therefore, the ideal solution is to always configure the metrics path to listen on localhost:9000/metrics, so the behaviour will be the same on ephemeral, stage, and prod environments, and for quarkus and spring services.

This was already done for the swatch-metrics service by SWATCH-2192.

Acceptance Criteria

• Apply the same changes from SWATCH-2192 to all Quarkus services.
• Remove the Quarkus Service Monitor for stage and prod from the app-interface repository.