Making metrics with labels for embedded Infinispan the default

Closes #25935

Signed-off-by: Alexander Schwartz <aschwart@redhat.com>

docs/documentation/release_notes/topics/24_0_0.adoc

@@ -117,3 +117,10 @@ will be shown.
 
 In addition to that, a new error (`EMAIL_ALREADY_VERIFIED`) event will be fired to indicate an attempt to verify an already verified email. You can
 use this event to track possible attempts to hijack user accounts in case the link has leaked or to alert users if they do not recognize the action.
+
+= Infinispan metrics use labels for cache manager and cache names
+
+When enabling metrics for {project_name}'s embedded caches, the metrics now use labels for the cache manager and the cache names.
+
+For more details, check the
+link:{upgradingguide_link}[{upgradingguide_name}].

docs/documentation/upgrading/topics/keycloak/changes-24_0_0.adoc

@@ -143,3 +143,23 @@ and potentially introduce unexpected changes and behavior that should only affec
 
 If you have customizations to the `login-update-profile.ftl` template to customize how users update their profiles when authenticating through a broker, make sure to move your changes
 to the new template.
+
+= Infinispan metrics use labels for cache manager and cache names
+
+When enabling metrics for {project_name}'s embedded caches, the metrics now use labels for the cache manager and the cache names.
+
+.Old metric example without labels
+----
+vendor_cache_manager_keycloak_cache_sessions_statistics_approximate_entries_in_memory{cache="sessions",node="..."}
+----
+
+.New metric example with labels
+----
+vendor_statistics_approximate_entries_in_memory{cache="sessions",cache_manager="keycloak",node="..."}
+----
+
+To revert the change for an installation, use a custom Infinispan XML configuration and change the configuration as follows:
+
+----
+<metrics names-as-tags="false" />
+----

quarkus/runtime/src/main/resources/cache-ispn.xml

@@ -23,6 +23,7 @@
 
     <cache-container name="keycloak">
         <transport lock-timeout="60000"/>
+        <metrics names-as-tags="true" />
         <local-cache name="realms" simple-cache="true">
             <encoding>
                 <key media-type="application/x-java-object"/>

quarkus/runtime/src/main/resources/cache-local.xml

@@ -22,6 +22,7 @@
         xmlns="urn:infinispan:config:14.0">
 
     <cache-container name="keycloak">
+        <metrics names-as-tags="true" />
         <local-cache name="default">
             <transaction transaction-manager-lookup="org.infinispan.transaction.lookup.JBossStandaloneJTAManagerLookup"/>
         </local-cache>