Measured 2026-08-05: nova-cloud-controller + rabbitmq-server (native erlang 3-node cluster)
+ barbican scaled to 3-unit HA. 12 of 14 HA apps at 3-unit HA. Only keystone (cloud-wide
auth VIP blip) and vault (operator unseal) remain -- both operator-gated. vault HA also
resolves the barbican-vault secrets-storage dependency.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Fg98z7QyzwYUs8fsWCn728