docs: fill the untested items and record why the B layer has no graphs

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>
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DongHyeonka
2026-09-04 16:18:33 +09:00
co-authored by Claude Opus 5
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## 구조
![A-7 구조 — 두 모드의 데이터 흐름과 뒤집힌 결과](diagrams/a7-volatile-inversion.svg)
> 다이어그램 규약은 [`diagrams/_style.md`](diagrams/_style.md).
---
## 0. 결론부터 — 비교표
| 실험 | persistent (KC 26 기본) | **volatile (KC 24 이전 방식)** |