Ships the data + runtime layer of Stream E. The SignalR hub and Blazor /hosts
page refresh (E.2-E.3) are follow-up work paired with the visual-compliance
review per Phase 6.4 patterns — documented as a deferred follow-up below.
Configuration:
- New entity DriverInstanceResilienceStatus with:
DriverInstanceId, HostName (composite PK),
LastCircuitBreakerOpenUtc, ConsecutiveFailures, CurrentBulkheadDepth,
LastRecycleUtc, BaselineFootprintBytes, CurrentFootprintBytes,
LastSampledUtc.
- Separate from DriverHostStatus (per-host connectivity view) so a Running
host that has tripped its breaker or is nearing its memory ceiling shows up
distinctly on Admin /hosts. Admin page left-joins both for display.
- OtOpcUaConfigDbContext + Fluent-API config + IX_DriverResilience_LastSampled
index for the stale-sample filter query.
- EF migration: 20260419124034_AddDriverInstanceResilienceStatus.
Core.Resilience:
- DriverResilienceStatusTracker — process-singleton in-memory tracker keyed on
(DriverInstanceId, HostName). CapabilityInvoker + MemoryTracking +
MemoryRecycle callers record failure/success/breaker-open/recycle/footprint
events; a HostedService (Stream E.2 follow-up) samples this tracker every
5 s and persists to the DB. Pure in-memory keeps tests fast + the core
free of EF/SQL dependencies.
Tests:
- DriverResilienceStatusTrackerTests (9 new, all pass): tryget-before-write
returns null; failures accumulate; success resets; breaker/recycle/footprint
fields populate; per-host isolation; snapshot returns all pairs; concurrent
writes don't lose counts.
- SchemaComplianceTests: expected-tables list updated to include the new
DriverInstanceResilienceStatus table.
Full solution dotnet test: 1042 passing (baseline 906, +136 for Phase 6.1 so
far across Streams A/B/C/D/E.1). Pre-existing Client.CLI Subscribe flake
unchanged.
Deferred to follow-up PR (E.2/E.3):
- ResilienceStatusPublisher HostedService that samples DriverResilienceStatusTracker
every 5 s + upserts DriverInstanceResilienceStatus rows.
- Admin FleetStatusHub SignalR hub pushing LastCircuitBreakerOpenUtc /
CurrentBulkheadDepth / LastRecycleUtc on change.
- Admin /hosts Blazor column additions (red badge when
ConsecutiveFailures > breakerThreshold / 2). Visual-compliance reviewer
signoff alongside Phase 6.4 admin-ui patterns.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
