The forward upgrade to 26.7.3 was zero downtime across 87 samples, and since databasechangelog stayed at 210 the rollback to 26.7.0 also succeeded, which narrows D-2's conclusion: rolling back fails when the schema moved, not because of the version number. The row count is the check.
Role changes never reach the upstream through request repetition; the session is a snapshot taken at login and only a new session picks up the new claim. Auditing the docs also surfaced that Prometheus scrapes only keycloak, kubelet, node-exporter and itself, so the B-layer experiments have no metrics to screenshot rather than missing screenshots.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Disabling persistent-user-sessions moves the session from PostgreSQL into the cluster, and the A-1 and A-8 outcomes flip to 400 Session not active while a new login during database loss starts working. The control group in each case still returns 200, so the injections cut only what they were meant to cut.
This is the pair that makes the A layer legible: the conventional wisdom that sessions ride TCP 7800 is correct for Keycloak 24 and earlier, and the mistake is applying it to 26 without checking the version.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
