Joseph Doherty 1d9008e354 Phase 6.1 Stream B.3/B.4/B.5 — MemoryRecycle + ScheduledRecycleScheduler + demand-aware WedgeDetector ...

Closes out Stream B per docs/v2/implementation/phase-6-1-resilience-and-observability.md.

Core.Abstractions:
- IDriverSupervisor — process-level supervisor contract a Tier C driver's
  out-of-process topology provides (Galaxy Proxy/Supervisor implements this in
  a follow-up Driver.Galaxy wiring PR). Concerns: DriverInstanceId + RecycleAsync.
  Tier A/B drivers don't implement this; Stream B code asserts tier == C before
  ever calling it.

Core.Stability:
- MemoryRecycle — companion to MemoryTracking. On HardBreach, invokes the
  supervisor IFF tier == C AND a supervisor is wired. Tier A/B HardBreach logs
  a promotion-to-Tier-C recommendation and returns false. Soft/None/Warming
  never triggers a recycle at any tier.
- ScheduledRecycleScheduler — Tier C opt-in periodic recycler per decision #67.
  Ctor throws for Tier A/B (structural guard — scheduled recycle on an
  in-process driver would kill every OPC UA session and every co-hosted
  driver). TickAsync(now) advances the schedule by one interval per fire;
  RequestRecycleNowAsync drives an ad-hoc recycle without shifting the cron.
- WedgeDetector — demand-aware per decision #147. Classify(state, demand, now)
  returns:
    * NotApplicable when driver state != Healthy
    * Idle when Healthy + no pending work (bulkhead=0 && monitored=0 && historic=0)
    * Healthy when Healthy + pending work + progress within threshold
    * Faulted when Healthy + pending work + no progress within threshold
  Threshold clamps to min 60 s. DemandSignal.HasPendingWork ORs the three counters.
  The three false-wedge cases the plan calls out all stay Healthy: idle
  subscription-only, slow historian backfill making progress, write-only burst
  with drained bulkhead.

Tests (22 new, all pass):
- MemoryRecycleTests (7): Tier C hard-breach requests recycle; Tier A/B
  hard-breach never requests; Tier C without supervisor no-ops; soft-breach
  at every tier never requests; None/Warming never request.
- ScheduledRecycleSchedulerTests (6): ctor throws for A/B; zero/negative
  interval throws; tick before due no-ops; tick at/after due fires once and
  advances; RequestRecycleNow fires immediately without shifting schedule;
  multiple fires across ticks advance one interval each.
- WedgeDetectorTests (9): threshold clamp to 60 s; unhealthy driver always
  NotApplicable; idle subscription stays Idle; pending+fresh progress stays
  Healthy; pending+stale progress is Faulted; MonitoredItems active but no
  publish is Faulted; MonitoredItems active with fresh publish stays Healthy;
  historian backfill with fresh progress stays Healthy; write-only burst with
  empty bulkhead is Idle; HasPendingWork theory for any non-zero counter.

Full solution dotnet test: 989 passing (baseline 906, +83 for Phase 6.1 so far).
Pre-existing Client.CLI Subscribe flake unchanged.

Stream B complete. Next up: Stream C (health endpoints + structured logging).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-04-19 08:03:18 -04:00

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