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openspec/archive/2026-05-12-enterprise-network-observability/proposal.md

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+# OpenSpec Change: enterprise-network-observability
+
+- **Change ID**: enterprise-network-observability
+- **Package**: `@suaveplan/network-observability`
+- **Category**: universal/network
+- **Target path**: `universal/network/network-observability`
+- **Status**: SUPERSEDED-BY-GENESIS-WAVE
+- **Date**: 2026-04-24
+
+---
+
+## Summary
+
+Deliver `@suaveplan/network-observability` on the genesis branch from scratch at enterprise quality. The package provides network metrics collection and distributed tracing instrumentation: RTT measurements, bandwidth estimation, connection health scoring, packet loss tracking, span propagation across network hops, and structured event emission for network anomalies. Genesis adds structured errors via `@suaveplan/error`, Zod schemas for all metric types, deep OTel integration (this package is specifically about observability), `AbortSignal` on collection tasks, injectable `Clock` for measurement timestamps, and event-bus emission for threshold breaches.
+
+---
+
+## Current-state audit (genesis)
+
+The package does not exist on genesis yet — this is a fresh build.
+
+---
+
+## Available workspace deps on genesis
+
+| Package | Role |
+|---|---|
+| `@suaveplan/error` (`workspace:^`) | Base class for `NetworkObservabilityError`; stable error codes |
+| `@suaveplan/types` (`workspace:^`) | `LoggerLike`, `Clock`, `EventBusLike` |
+| `@suaveplan/events` (`workspace:^`) | Event bus for threshold breach notifications |
+| `@suaveplan/logger` (`workspace:^`) | Structured logging |
+| `@suaveplan/timing` (`workspace:^`) | Stopwatch and throttle for measurement intervals |
+| `zod` (`catalog:forms`) | Zod schemas for all public metric types |
+| `@opentelemetry/api` (`catalog:observability`) | Deep OTel integration — this package enriches OTel spans |
+| `tslib` (`catalog:build`) | Runtime helpers |
+
+Dev deps: `vitest`, `@vitest/coverage-istanbul`, `fast-check` (all `catalog:testing`).
+
+---
+
+## Public API surface
+
+### Core
+
+```ts
+function createNetworkMonitor(options?: NetworkMonitorOptions): NetworkMonitor
+
+interface NetworkMonitor {
+  start(signal?: AbortSignal): Promise<void>
+  stop(): void
+  snapshot(): NetworkSnapshot
+  history(limit?: number): ReadonlyArray<NetworkSnapshot>
+  on(event: NetworkEvent, handler: (data: NetworkSnapshot) => void): () => void
+}
+```
+
+### Metric types
+
+```ts
+interface NetworkSnapshot {
+  readonly timestamp: number
+  readonly rtt: RttMetrics
+  readonly bandwidth: BandwidthMetrics
+  readonly packetLoss: PacketLossMetrics
+  readonly health: NetworkHealthScore
+}
+
+interface RttMetrics {
+  readonly current: number
+  readonly min: number
+  readonly max: number
+  readonly avg: number
+  readonly p50: number
+  readonly p95: number
+  readonly p99: number
+  readonly samples: number
+}
+
+interface BandwidthMetrics {
+  readonly downloadBps: number
+  readonly uploadBps?: number
+  readonly estimatedAt: number
+}
+
+interface PacketLossMetrics {
+  readonly rate: number  // 0–1
+  readonly total: number
+  readonly lost: number
+}
+
+interface NetworkHealthScore {
+  readonly score: number  // 0–100
+  readonly grade: 'excellent' | 'good' | 'fair' | 'poor' | 'critical'
+  readonly factors: ReadonlyArray<HealthFactor>
+}
+
+interface HealthFactor {
+  readonly name: string
+  readonly weight: number
+  readonly score: number
+  readonly impact: 'positive' | 'negative' | 'neutral'
+}
+```
+
+### Span propagation
+
+```ts
+function injectTraceContext(headers: Record<string, string>): Record<string, string>
+function extractTraceContext(headers: Record<string, string>): SpanContext | null
+function withNetworkSpan<T>(name: string, fn: () => Promise<T>, attributes?: NetworkSpanAttributes): Promise<T>
+
+interface NetworkSpanAttributes {
+  url?: string
+  method?: string
+  statusCode?: number
+  requestSize?: number
+  responseSize?: number
+}
+```
+
+### Options
+
+```ts
+interface NetworkMonitorOptions {
+  measureIntervalMs?: number
+  historySize?: number
+  rttTargetUrl?: string
+  thresholds?: NetworkThresholds
+  logger?: LoggerLike
+  clock?: Clock
+  eventBus?: EventBusLike
+}
+
+interface NetworkThresholds {
+  maxRttMs?: number
+  minBandwidthBps?: number
+  maxPacketLossRate?: number
+  minHealthScore?: number
+}
+
+type NetworkEvent = 'snapshot' | 'threshold-breach' | 'recovery'
+```
+
+### Error codes
+
+```ts
+type NetworkObservabilityErrorCode =
+  | 'NET_OBS_MEASUREMENT_FAILED'
+  | 'NET_OBS_MONITOR_ALREADY_RUNNING'
+  | 'NET_OBS_ABORT'
+
+function registerNetworkObservabilityErrorCodes(): void
+```
+
+---
+
+## Genesis additions
+
+1. **Structured `NetworkObservabilityError`** with stable `NET_OBS.*` codes
+2. **Zod schemas** for all metric types and options
+3. **Health scoring algorithm** — weighted composite of RTT, packet loss, bandwidth; grades A–F
+4. **W3C Trace Context propagation** helpers (`injectTraceContext`, `extractTraceContext`)
+5. **Threshold alerting** — emits event-bus events when thresholds are breached or recovered
+6. **Injectable `Clock`** for deterministic timestamp tests
+7. **OTel deep integration** — this package is the entry point for network-layer OTel spans
+
+---
+
+## File layout
+
+```text
+universal/network/network-observability/
+  package.json
+  tsconfig.json
+  vitest.config.ts
+  src/
+    index.ts
+    error-codes.ts
+    constants/
+      index.ts
+    types/
+      common.ts
+      common.md
+    core/
+      monitor/
+        monitor.ts
+        monitor.md
+        monitor.types.ts
+        monitor.test.ts
+        index.ts
+      health/
+        health.ts
+        health.md
+        health.test.ts
+        index.ts
+    tracing/
+      propagation.ts
+      propagation.md
+      propagation.test.ts
+      index.ts
+    metrics/
+      rtt.ts
+      rtt.md
+      rtt.test.ts
+      bandwidth.ts
+      bandwidth.md
+      bandwidth.test.ts
+  tests/
+    integration.test.ts
+    property.test.ts
+```
+
+---
+
+## Impact
+
+**Workspace dep prerequisites**: `@suaveplan/error`, `@suaveplan/types`, `@suaveplan/events`, `@suaveplan/logger`, `@suaveplan/timing` must be published.