All 6 site nodes flipped to CentralTransport=Grpc; whole control plane
(heartbeat/health/notification S&F/audit) rides gRPC CentralControlService,
196 RPCs/90s 0 non-200, 0 PermissionDenied, 0 health-sequence regressions.
Soak driven by a live SoakNotify workload (3 instances, 3 notifs/5s):
- single-node active-kill (central-a): sticky failover central-a:8083→b:8083
logged instantly, central-b active in 29s, buffer drained 72→101, every 5s
bucket = exactly 3 through the gap, 101==101 distinct
- failback: central-a rejoined ready ~5s as standby, central-b kept active
(oldest-Up, no flap), traffic uninterrupted
- full outage (both central down ~59s): count frozen, cold re-form central-b
active ~14s, ~42 buffered drained, every 5s bucket = exactly 3 across the
whole dead window, 216==216 distinct — zero loss, zero dupes
Also previews Phase 5 checks 4 (failover/failback) and 5 (mid-drain kill).
Rig config reverted to Akka default (defaults stay Akka until Phase 4).
Joseph Doherty
a54602c14a