Keycloak upgrades

Planning Keycloak version upgrades: what changed in the 26 line, how the database migrates, and when rolling updates avoid downtime.

Keycloak 25 to 26 upgrade

Moving from Keycloak 25 to 26 without losing sessions: enabling persistent sessions first, the Protostream cache change, hostname v2 and proxy-headers, and testing custom providers against the new release.

Keycloak 26 minor upgrades to 26.8

Keeping a Keycloak 26 deployment current through the quarterly minor releases: reading the per-release migration notes, opt-in breaking changes, and the 26.8 changes to SMTP, logout tokens and multi-site.

Keycloak zero-downtime patch upgrades

Applying Keycloak patch releases without an outage: the update-compatibility check, rolling restarts behind sticky sessions, and the Operator rolling update strategy.

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