# E9.M1 — TelemetryEventSchema

## Summary

| Field | Value |
|--------|--------|
| **Module ID** | E9.M1 |
| **Epic** | [Epic 9 — LiveOps / Integrity](../epics/epic_09_liveops_integrity.md) |
| **Stage target** | Prototype |
| **Status** | Planned (see [dependency register](module_dependency_register.md)) |

## Purpose

Artifact policy for telemetry (envelope, field naming, versioning) aligns with [contracts.md — contract kinds](contracts.md#contract-kinds) and **Telemetry** row. **PII, sampling, retention, baseline list:** [Data reload and telemetry operations policy](data_and_ops_policy.md).

Canonical taxonomy and versioning for gameplay and operations events: session, progression, economy, combat, PvP, movement desync, and integrity-adjacent signals. Provides the shared **envelope** so every epic can instrument consistently and breaking changes are explicit.

## Responsibilities

- Define `TelemetryEvent` shapes (or schema IDs) and required context fields.
- Govern `EventSchemaVersion` and migration rules for ingest pipelines.
- Specify `ClientEventEnvelope` (batching, privacy guardrails, delivery semantics) for prototype SDK.

## Key contracts

| Contract | Role |
|----------|------|
| `TelemetryEvent` | Named event with versioned payload; single registry or catalog. |
| `EventSchemaVersion` | Bump policy when fields or semantics change. |
| `ClientEventEnvelope` | Transport wrapper: timestamps, session, sampling, PII policy hooks. |

## Module dependencies

- **None** — horizontal capability; other modules depend on E9.M1 for event names and fields.

## Dependents (by design)

- **E9.M2** — KpiDashboardsAndAlerting: aggregates and gates.
- **E9.M4** — IntegrityAndAbuseResponse: correlates signals to incidents.
- **All epics** — Slices reference concrete events (e.g. `xp_grant`, `zone_enter`, `pvp_state_changed`) once schema exists.

## Related implementation slices

See Epic 9 **Slice 1 — Baseline event SDK and schema versioning**: prototype funnel events match master plan baseline; breaking changes versioned; telemetry for `schema_version_mismatch` and ingest errors.

## Risks and telemetry

- Noise drowning signals: decision-driven instrumentation, sampling strategy from master plan.
- Privacy: guardrails in envelope and field catalog before wide client shipment.

## Source anchors

- Master plan: [`neon_sprawl_vision.plan.md`](../../../neon_sprawl_vision.plan.md) — Core Epic Map, Epic 9.
- [Module dependency register](module_dependency_register.md)