Metrics that an admin can use for capacity planning of the system

[ahus1]

Description

Metrics that an admin can use for capacity planning of the system, especially those we use in the sizing guide (number of password based logins, number token refreshes, number of client credential grants). A growth in those metrics would indicate they would need to increase the resources of Keycloak in-line with actual and anticipated growth.

Tasks

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1. Provide missing user event metrics from aerogear/keycloak-metrics-spi to a keycloak mircometer event listener #33043
   kind/feature release/26.1.0 team/sre +3
   
2. Rework global event listener for metrics #34602
   area/core kind/bug priority/important release/26.1.0 team/sre +5
   
3. enable event-metrics-user-enabled in Keycloak benchmark deployments keycloak-benchmark#1050
   1 of 5
   +0
   
4. Add metrics that might be missing for password based logins
5. Make user events feature supported
6. (Maybe a calculator as a stretch goal or a dashboard or ???)
7. How to size the internal caches