# Sprint 174 - Notifications & Telemetry · 170.B) Telemetry

> **BLOCKED Tasks:** Before working on BLOCKED tasks, review [BLOCKED_DEPENDENCY_TREE.md](./BLOCKED_DEPENDENCY_TREE.md) for root blockers and dependencies.

Active items only. Completed/historic work now resides in docs/implplan/archived/tasks.md (updated 2025-11-08).

[Notifications & Telemetry] 170.B) Telemetry
Depends on: Sprint 150.A - Orchestrator
Summary: Notifications & Telemetry focus on Telemetry).
Task ID | State | Task description | Owners (Source)
--- | --- | --- | ---
TELEMETRY-OBS-50-001 | DONE (2025-11-19) | `StellaOps.Telemetry.Core` bootstrap library shipped with structured logging facade, OTEL configuration helpers, deterministic bootstrap (service name/version detection, resource attributes), and sample usage for web/worker hosts. Evidence: `docs/observability/telemetry-bootstrap.md`. | Telemetry Core Guild (src/Telemetry/StellaOps.Telemetry.Core)
TELEMETRY-OBS-50-002 | DONE (2025-11-27) | Implement context propagation middleware/adapters for HTTP, gRPC, background jobs, and CLI invocations, carrying `trace_id`, `tenant_id`, `actor`, and imposed-rule metadata. Provide test harness covering async resume scenarios. Dependencies: TELEMETRY-OBS-50-001. | Telemetry Core Guild (src/Telemetry/StellaOps.Telemetry.Core)
TELEMETRY-OBS-51-001 | DONE (2025-11-27) | Ship metrics helpers for golden signals (histograms, counters, gauges) with exemplar support and cardinality guards. Provide Roslyn analyzer preventing unsanitised labels. Dependencies: TELEMETRY-OBS-50-002. Evidence: `GoldenSignalMetrics.cs` + `StellaOps.Telemetry.Analyzers` project with `MetricLabelAnalyzer` (TELEM001/002/003 diagnostics). | Telemetry Core Guild, Observability Guild (src/Telemetry/StellaOps.Telemetry.Core)
TELEMETRY-OBS-51-002 | DONE (2025-11-27) | Implement redaction/scrubbing filters for secrets/PII enforced at logger sink, configurable per-tenant with TTL, including audit of overrides. Add determinism tests verifying stable field order and timestamp normalization. Dependencies: TELEMETRY-OBS-51-001. Evidence: `LogRedactor`, `LogRedactionOptions`, `RedactingLogProcessor`, `DeterministicLogFormatter` + test suites. | Telemetry Core Guild, Security Guild (src/Telemetry/StellaOps.Telemetry.Core)
TELEMETRY-OBS-55-001 | DONE (2025-11-28) | Provide incident mode toggle API that adjusts sampling, enables extended retention tags, and records activation trail for services. Ensure toggle honored by all hosting templates and integrates with Config/FeatureFlag providers. Dependencies: TELEMETRY-OBS-51-002. Evidence: `IIncidentModeService`/`IncidentModeService` with full state management, TTL handling, events, persistence; `IncidentModeOptions` for configuration; `AddIncidentMode()` DI extension; comprehensive test suite in `IncidentModeServiceTests`. | Telemetry Core Guild (src/Telemetry/StellaOps.Telemetry.Core)
TELEMETRY-OBS-56-001 | DONE (2025-11-28) | Add sealed-mode telemetry helpers (drift metrics, seal/unseal spans, offline exporters) and ensure hosts can disable external exporters when sealed. Dependencies: TELEMETRY-OBS-55-001. Evidence: `ISealedModeTelemetryService`/`SealedModeTelemetryService` with metrics counters (`sealEventsCounter`, `unsealEventsCounter`, `driftEventsCounter`, `blockedExportsCounter`), `SealedModeFileExporter` for offline export, `TelemetryExporterGuard` for blocking external exporters; `AddSealedModeTelemetry()` DI extension; test suite in `SealedModeTelemetryServiceTests`. | Telemetry Core Guild (src/Telemetry/StellaOps.Telemetry.Core)

## Status notes (2025-11-28 UTC)

- **TELEMETRY-OBS-50-001** – DONE. Library merged with deterministic bootstrap helpers; sample host + test harness published in `docs/observability/telemetry-bootstrap.md`.
- **TELEMETRY-OBS-50-002** – DONE. Context propagation middleware for HTTP, gRPC, CLI, and background jobs; includes async resume test harness.
- **TELEMETRY-OBS-51-001** – DONE. Golden signal metrics (`GoldenSignalMetrics.cs`) with exemplar support and cardinality guards. Roslyn analyzer project (`StellaOps.Telemetry.Analyzers`) with `MetricLabelAnalyzer` enforcing TELEM001/002/003 diagnostics.
- **TELEMETRY-OBS-51-002** – DONE. `ILogRedactor`/`LogRedactor` with pattern-based and field-name redaction. Per-tenant overrides with TTL and audit logging. `DeterministicLogFormatter` ensures stable field ordering and UTC timestamp normalization.
- **TELEMETRY-OBS-55-001** – DONE. Incident mode toggle API implemented with `IIncidentModeService`/`IncidentModeService` providing: sampling adjustment, extended retention tags, activation trail recording, state persistence, events, TTL management with extension support, CLI/API/config activation sources. DI registration via `AddIncidentMode()`. Full test suite.
- **TELEMETRY-OBS-56-001** – DONE. Sealed-mode telemetry helpers implemented with `ISealedModeTelemetryService`/`SealedModeTelemetryService` providing: drift metrics counters, seal/unseal spans, offline file exporter (`SealedModeFileExporter`), external exporter blocking via `TelemetryExporterGuard`. DI registration via `AddSealedModeTelemetry()`. Full test suite.

## Milestones & dependencies

| Target date | Milestone | Owner(s) | Notes / dependencies |
| --- | --- | --- | --- |
| 2025-11-18 | Land Telemetry.Core bootstrap sample in Orchestrator | Telemetry Core Guild · Orchestrator Guild | Demonstrates TELEMETRY-OBS-50-001 deliverable; prerequisite for propagation middleware adoption. |
| 2025-11-19 | Publish propagation adapter API draft | Telemetry Core Guild | Needed for TELEMETRY-OBS-50-002 and downstream service adoption. |
| 2025-11-21 | Security sign-off on scrub policy (POLICY-SEC-42-003) | Telemetry Core Guild · Security Guild | Unlocks TELEMETRY-OBS-51-001/51-002 implementation. |
| 2025-11-22 | Incident/CLI toggle contract agreed (CLI-OBS-12-001 + NOTIFY-OBS-55-001) | Telemetry Core Guild · Notifications Service Guild · CLI Guild | Required before TELEMETRY-OBS-55-001/56-001 can advance. |

## Coordination log

| Date (UTC) | Update | Owner |
| --- | --- | --- |
| 2025-11-12 18:05 | Marked TELEMETRY-OBS-50-001 as DOING and captured branch/progress details in status notes. | Telemetry Core Guild |
| 2025-11-19 | Marked TELEMETRY-OBS-50-001 DONE; evidence: library merged + `docs/observability/telemetry-bootstrap.md` with sample host integration. | Implementer |
| 2025-11-27 | Marked TELEMETRY-OBS-50-002 DONE; added gRPC interceptors, CLI context, and async resume test harness. | Implementer |
| 2025-11-27 | Marked TELEMETRY-OBS-51-001 DONE; created `StellaOps.Telemetry.Analyzers` project with `MetricLabelAnalyzer` (TELEM001/002/003) and test suite. | Implementer |
| 2025-11-27 | Marked TELEMETRY-OBS-51-002 DONE; implemented `LogRedactor`, `LogRedactionOptions`, `RedactingLogProcessor`, `DeterministicLogFormatter` with comprehensive test suites. | Implementer |
| 2025-11-28 | Marked TELEMETRY-OBS-55-001 DONE; verified existing implementation of `IIncidentModeService`/`IncidentModeService` with state management, TTL handling, events, persistence, and comprehensive test suite. | Implementer |
| 2025-11-28 | Marked TELEMETRY-OBS-56-001 DONE; verified existing implementation of `ISealedModeTelemetryService`/`SealedModeTelemetryService` with metrics, spans, offline exporter, and exporter guard. Sprint 174 Telemetry complete. | Implementer |