Description

Background:

https://www.keycloak.org/high-availability/concepts-threads#_jgroups_connection_pool suggests to watch the metric vendor_jgroups_tcp_get_thread_pool_size_active to check the ratio compared to the Quarkus threads. However, this metrics is not shown for the embedded Infinispan even after enabling cache statistics.

Task:

1. Find out if this metric can be enabled for embedded Infinispan.
2. If yes, enable it if Keycloak metrics are enabled.
3. If no, adapt documentation to state these metrics are only available with external Infinispan.