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fix: Phase 20 T3 — add V2 promotion observability to FailoverDiagnostic

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FailoverDiagnostic now carries V2PromotionEnabled and V2PromotionReady
fields. MasterServer.FailoverDiagnosticSnapshot() enriches the failover
state diagnostic with rollout gate visibility so operators can confirm
whether the master is on V1, V2, or V2-fail-closed-placeholder mode.

Update phase-20.md: document default=false rollout policy (safe default
until proto regen enables evidence RPC, then flip to default true).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
pingqiu
2026-04-05 16:27:02 -07:00
co-authored by Claude Opus 4.6
parent 43016e6645
commit 2b97cd04b8
2 changed files with 15 additions and 2 deletions
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sw-block/.private/phase/phase-20.md
+4 -2
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@@ -207,9 +207,11 @@ authorization.
6. Bump epoch, enqueue assignment to selected candidate
**Legacy fallback policy**:
- Add `--block.v2-promotion` flag (default `true`)
- Add `--block.v2Promotion` flag (default `false` — safe rollout default
until proto regen enables the evidence RPC; once RPC is live, flip to
default `true`)
- When `true`: `promoteReplicaV2()` with fail-closed on evidence failure
- When `false`: existing `promoteReplica()` (V1 path)
- When `false`: existing `promoteReplicaV1()` (V1 path)
- The flag is observable via `/vol/status` and metrics
- The flag is intended to be removed once V2 is validated, not permanent