- StorageClientOptions: Table/Queue 8 s per attempt × 3 attempts + capped backoffs = 25.8 s < the
agent's 30 s upload timeout (pinned by test); Blob 60 s × 4. Every production client takes its
options from there. No Polly over the SDK.
- StorageErrors.IsTransient(Exception): OperationCanceled / IO / HttpRequest / Aggregate-of-those
/ RequestFailed status 0; the ingest answers 503 + Retry-After instead of 500.
- The ingest still takes no caller cancellation (a batch is a unit). GetAllSessionsPageAsync
carries the request token down to BoundedFanOut (Global Admin list); SingleFlightCache hands its
factory a 30 s budget token and evicts on timeout (tenant ids, app-summary snapshot, session stats).
- ProcessStallMonitor: 1 s tick drift ≥ 1 s ⇒ ProcessStall event (sampling bypass) + metric with
cause gc / threadpool / unknown from GC.GetTotalPauseDuration and thread-pool counters;
GcPauseMs on request rows ≥ 100 ms. Measures the instance-local 5–10 s pauses seen in production.
- Gitlinks: internal (plan, D-203, concept doc, B-9hf, lesson), .claude/commands (marker rows).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The dependency filter dropped every successful storage call and the expected
412/409 outcomes, so storage-side latency and ETag contention were invisible
until a call failed outright (seven days of App Insights held zero storage
dependency rows).
- StorageDependencyFilterProcessor keeps a successful storage call at or above
2 s and stamps SlowStorage=true; the operation name is on the row, the table
name is not (the Azure SDK span carries neither URL nor table).
- StorageMetrics wraps TelemetryClient.GetMetric("StorageCasConflict",
operation, table, outcome): pre-aggregated per minute, bypasses the worker's
adaptive sampling, null-tolerant for tests.
- The CAS loops report conflicts: session event count, session counter
reconcile, session store, tenant stats, MCP user/tenant usage.
- TableStorageService keeps its two-argument constructors (Moq matches by
exact arity); DI resolves the three-argument overload.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Oliver Kieselbach