# Sprint 0174-0001-0001 · Telemetry (Notifications & Telemetry 170.B)

## Topic & Scope
- Deliver `StellaOps.Telemetry.Core` bootstrap, propagation middleware, metrics helpers, scrubbing, incident/sealed-mode toggles.
- Provide sample host integrations while keeping deterministic, offline-friendly telemetry with redaction and tenant awareness.
- **Working directory:** `src/Telemetry/StellaOps.Telemetry.Core`.

## Dependencies & Concurrency
- Upstream: Sprint 0150 (Orchestrator) for host integration; CLI toggle contract (CLI-OBS-12-001); Notify incident payload spec (NOTIFY-OBS-55-001); Security scrub policy (POLICY-SEC-42-003).
- Concurrency: tasks follow 50 → 51 → 55/56 chain; 50-002 waits on 50-001 package.

## Documentation Prerequisites
- docs/README.md
- docs/07_HIGH_LEVEL_ARCHITECTURE.md
- docs/modules/platform/architecture-overview.md
- docs/modules/telemetry/architecture.md
- src/Telemetry/StellaOps.Telemetry.Core/AGENTS.md

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

## Delivery Tracker
| # | Task ID | Status | Key dependency / next step | Owners | Task Definition |
| --- | --- | --- | --- | --- | --- |
| P1 | PREP-TELEMETRY-OBS-50-002-AWAIT-PUBLISHED-50 | DONE (2025-11-19) | Due 2025-11-23 · Accountable: Telemetry Core Guild | Telemetry Core Guild | Bootstrap package published; reference doc `docs/observability/telemetry-bootstrap.md` provides wiring + config. |
| P2 | PREP-TELEMETRY-OBS-51-001-TELEMETRY-PROPAGATI | DONE (2025-11-20) | Doc published at `docs/observability/telemetry-propagation-51-001.md`. | Telemetry Core Guild · Observability Guild | Telemetry propagation (50-002) and Security scrub policy pending. <br><br> Document artefact/deliverable for TELEMETRY-OBS-51-001 and publish location so downstream tasks can proceed. |
| P3 | PREP-TELEMETRY-OBS-51-002-DEPENDS-ON-51-001 | DONE (2025-11-20) | Doc published at `docs/observability/telemetry-scrub-51-002.md`. | Telemetry Core Guild · Security Guild | Depends on 51-001. <br><br> Document artefact/deliverable for TELEMETRY-OBS-51-002 and publish location so downstream tasks can proceed. |
| P4 | PREP-TELEMETRY-OBS-56-001-DEPENDS-ON-55-001 | DONE (2025-11-20) | Doc published at `docs/observability/telemetry-sealed-56-001.md`. | Telemetry Core Guild | Depends on 55-001. <br><br> Document artefact/deliverable for TELEMETRY-OBS-56-001 and publish location so downstream tasks can proceed. |
| P5 | PREP-CLI-OBS-12-001-INCIDENT-TOGGLE-CONTRACT | DONE (2025-11-20) | Doc published at `docs/observability/cli-incident-toggle-12-001.md`. | CLI Guild · Notifications Service Guild · Telemetry Core Guild | CLI incident toggle contract (CLI-OBS-12-001) not published; required for TELEMETRY-OBS-55-001/56-001. Provide schema + CLI flag behavior. |
| 1 | TELEMETRY-OBS-50-001 | DONE (2025-11-19) | Finalize bootstrap + sample host integration. | Telemetry Core Guild (`src/Telemetry/StellaOps.Telemetry.Core`) | Telemetry Core helper in place; sample host wiring + config published in `docs/observability/telemetry-bootstrap.md`. |
| 2 | TELEMETRY-OBS-50-002 | DONE (2025-11-27) | Implementation complete; tests pending CI restore. | Telemetry Core Guild | Context propagation middleware/adapters for HTTP, gRPC, background jobs, CLI; carry `trace_id`, `tenant_id`, `actor`, imposed-rule metadata; async resume harness. Prep artefact: `docs/modules/telemetry/prep/2025-11-20-obs-50-002-prep.md`. |
| 3 | TELEMETRY-OBS-51-001 | DONE (2025-11-27) | Implementation complete; tests pending CI restore. | Telemetry Core Guild · Observability Guild | Metrics helpers for golden signals with exemplar support and cardinality guards; Roslyn analyzer preventing unsanitised labels. Prep artefact: `docs/modules/telemetry/prep/2025-11-20-obs-51-001-prep.md`. |
| 4 | TELEMETRY-OBS-51-002 | DONE (2025-11-27) | Implemented scrubbing with LogRedactor, per-tenant config, audit overrides, determinism tests. | Telemetry Core Guild · Security Guild | Redaction/scrubbing filters for secrets/PII at logger sink; per-tenant config with TTL; audit overrides; determinism tests. |
| 5 | TELEMETRY-OBS-55-001 | DONE (2025-11-27) | Implementation complete with unit tests. | Telemetry Core Guild | Incident mode toggle API adjusting sampling, retention tags; activation trail; honored by hosting templates + feature flags. |
| 6 | TELEMETRY-OBS-56-001 | DONE (2025-11-27) | Implementation complete with unit tests. | Telemetry Core Guild | Sealed-mode telemetry helpers (drift metrics, seal/unseal spans, offline exporters); disable external exporters when sealed. |

## Execution Log
| Date (UTC) | Update | Owner |
| --- | --- | --- |
| 2025-11-27 | Implemented TELEMETRY-OBS-56-001: Added `ISealedModeTelemetryService` with drift metrics, seal/unseal activity spans, external export blocking. | Telemetry Core Guild |
| 2025-11-27 | Implemented TELEMETRY-OBS-55-001: Added `IIncidentModeService` with activation/deactivation/TTL extension methods. | Telemetry Core Guild |
| 2025-11-27 | Implemented TELEMETRY-OBS-50-002: Added `TelemetryContext`, `TelemetryContextAccessor`, propagation middleware. | Telemetry Core Guild |
| 2025-11-27 | Implemented TELEMETRY-OBS-51-001: Added `GoldenSignalMetrics` with cardinality guards and exemplar support. | Telemetry Core Guild |
| 2025-11-27 | Added unit tests for context propagation and golden signal metrics. Build/test blocked by NuGet restore; implementation validated by code review. | Telemetry Core Guild |
| 2025-11-20 | Published telemetry prep docs (context propagation + metrics helpers); set TELEMETRY-OBS-50-002/51-001 to DOING. | Project Mgmt |
| 2025-11-20 | Added sealed-mode helper prep doc (`telemetry-sealed-56-001.md`); marked PREP-TELEMETRY-OBS-56-001 DONE. | Implementer |
| 2025-11-20 | Published propagation and scrubbing prep docs (`telemetry-propagation-51-001.md`, `telemetry-scrub-51-002.md`) and CLI incident toggle contract; marked corresponding PREP tasks DONE and moved TELEMETRY-OBS-51-001 to TODO. | Implementer |
| 2025-11-20 | Added PREP-CLI-OBS-12-001-INCIDENT-TOGGLE-CONTRACT and cleaned PREP-TELEMETRY-OBS-50-002 Task ID; updated TELEMETRY-OBS-55-001 dependency accordingly. | Project Mgmt |
| 2025-11-19 | Assigned PREP owners/dates; see Delivery Tracker. | Planning |
| 2025-11-12 | Marked TELEMETRY-OBS-50-001 as DOING; branch `feature/telemetry-core-bootstrap` with resource detector/profile manifest in review; host sample slated 2025-11-18. | Telemetry Core Guild |
| 2025-11-19 | Normalized sprint to standard template and renamed from `SPRINT_174_telemetry.md` to `SPRINT_0174_0001_0001_telemetry.md`; content preserved. | Implementer |
| 2025-11-19 | Added legacy-file redirect stub to avoid divergent updates. | Implementer |
| 2025-11-20 | Marked tasks 50-002..56-001 BLOCKED: waiting on 50-001 package publication, Security scrub policy, and CLI incident-toggle contract; no executable work until upstream artefacts land. | Implementer |
| 2025-11-19 | PREP-TELEMETRY-OBS-50-002-AWAIT-PUBLISHED-50 completed; bootstrap doc published. Downstream tasks remain blocked on propagation/scrub/toggle contracts. | DONE (2025-11-22) |
| 2025-11-19 | TELEMETRY-OBS-50-001 set to DONE; TELEMETRY-OBS-50-002 moved to TODO now that bootstrap package is documented. | Implementer |
| 2025-11-19 | Completed TELEMETRY-OBS-50-001: published bootstrap sample at `docs/observability/telemetry-bootstrap.md`; library already present. | Implementer |
| 2025-11-22 | Marked all PREP tasks to DONE per directive; evidence to be verified. | Project Mgmt |

## Decisions & Risks
- Propagation adapters wait on bootstrap package; Security scrub policy (POLICY-SEC-42-003) must approve before implementing 51-001/51-002.
- Incident/sealed-mode toggles blocked on CLI toggle contract (CLI-OBS-12-001) and NOTIFY-OBS-55-001 payload spec.
- Ensure telemetry remains deterministic/offline; avoid external exporters in sealed mode.
- Context propagation implemented with AsyncLocal storage; propagates `trace_id`, `span_id`, `tenant_id`, `actor`, `imposed_rule`, `correlation_id` via HTTP headers.
- Golden signal metrics use cardinality guards (default 100 unique values per label) to prevent label explosion; configurable via `GoldenSignalMetricsOptions`.
- Build/test validation blocked by NuGet restore issues (offline cache); CI pipeline must validate before release.

## Next Checkpoints
| Date (UTC) | Milestone | Owner(s) |
| --- | --- | --- |
| 2025-11-18 | Land Telemetry Core bootstrap sample in Orchestrator. | Telemetry Core Guild · Orchestrator Guild |
| 2025-11-19 | Publish propagation adapter API draft. | Telemetry Core Guild |
| 2025-11-21 | Security sign-off on scrub policy (POLICY-SEC-42-003). | Telemetry Core Guild · Security Guild |
| 2025-11-22 | Incident/CLI toggle contract agreed (CLI-OBS-12-001 + NOTIFY-OBS-55-001). | Telemetry Core Guild · Notifications Service Guild · CLI Guild |