Multi-Cluster v2 and Stateless Mode now in Preview

Starting with Keycloak 26.7, the stateless feature is available as a preview. It fundamentally simplifies how Keycloak handles volatile data — authentication sessions, action tokens, and brute-force counters move from embedded or external Infinispan caches to the database. The result: Keycloak deployments that are easier to operate, more resilient, and ready for multi-cluster setups without an external Infinispan cluster.