Switch the endpoint to management port

[lerminou]

Description

From Keycloak 25, the keycloak metrics are now exported by default on the management port (TCP/9000)

https://www.keycloak.org/server/configuration-metrics

We can still use the http port to serve the metrics but they will remove this option.

Kubernetes helm deployments often have one service and servicemonitor for prometheus builtin

• official keycloak helm chart
• keycloak operator
• bitnami helm chart

Expected Behavior

metrics are exported on the management port

Actual Behavior

metrics are on the http port only

[dalbani]

For the record, this was the related PR for Keycloak, if I'm not mistaken: keycloak/keycloak#27629.