telemetry has zero micro-lib dependencies — only the external OTel SDK.
Tier 1 reflects its actual position in the dependency graph. The Tier 5
label was misleading about push/tag ordering; telemetry can be released
independently of all other micro-lib modules.
Single-call OTel SDK bootstrap setting all three global providers (traces → Tempo, metrics → Mimir, logs → Loki) over OTLP gRPC.
What's included:
- New(ctx, Config): bootstraps TracerProvider, MeterProvider, and LoggerProvider with OTLP gRPC exporters; sets OTel globals
- W3C TraceContext + Baggage propagation set globally
- Resource tagging: service.name, service.version, deployment.environment merged with SDK defaults
- OTLPInsecure bool for development environments without TLS
- Sequential rollback on partial initialization failure — no dangling exporters on error
- Returns shutdown func(context.Context) error; caller defers in main or wires into launcher BeforeStop
- Tier 5 module: must be imported only by application main packages; zero micro-lib dependencies
Tested-via: todo-api POC integration
Reviewed-against: docs/adr/
