telemetry/CHANGELOG.md

# Changelog

All notable changes to this module will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this module adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [1.0.0] - 2026-05-12

### Changed

- Go directive bumped from 1.25 to 1.26
- Shutdown function now wraps each provider error with a `providerErr` type that
  prefixes the signal name (`"telemetry: trace provider shutdown: …"`,
  `"telemetry: metric provider shutdown: …"`, `"telemetry: log provider shutdown: …"`).
  The combined error is still joined with `errors.Join`; individual causes remain
  unwrappable via `errors.As`. Previously, the three errors were joined without labels.

### Stabilization

- API committed as stable. `Config`, `New`, and the shutdown function signature
  (`func(context.Context) error`) are unchanged from v0.9.0.

[1.0.0]: https://code.nochebuena.dev/go/telemetry/compare/v0.9.0...v1.0.0

## [0.9.0] - 2026-03-18

### Added

- `Config` struct — holds OTel bootstrap configuration with env-tag support: `ServiceName` (`OTEL_SERVICE_NAME`, required), `ServiceVersion` (`OTEL_SERVICE_VERSION`, default `unknown`), `Environment` (`OTEL_ENVIRONMENT`, default `development`), `OTLPEndpoint` (`OTEL_EXPORTER_OTLP_ENDPOINT`, required), `OTLPInsecure` (`OTEL_EXPORTER_OTLP_INSECURE`, default `false`)
- `New(ctx context.Context, cfg Config) (func(context.Context) error, error)` — bootstraps the full OpenTelemetry SDK by creating three OTLP gRPC exporters and their corresponding SDK providers: `TracerProvider` (traces → Grafana Alloy → Tempo), `MeterProvider` (metrics → Grafana Alloy → Mimir), and `LoggerProvider` (logs → Grafana Alloy → Loki); sets all three OTel globals (`otel.SetTracerProvider`, `otel.SetMeterProvider`, `global.SetLoggerProvider`) and installs W3C TraceContext and Baggage as the global text map propagator; returns `(shutdown, nil)` on success or `(nil, error)` on failure with sequential rollback of any already-created providers
- Shutdown function `func(context.Context) error` — returned by `New`; flushes and shuts down all three providers using `errors.Join`, allowing deferred call in `main` or wiring into a launcher `BeforeStop` hook
- OTel resource construction — every signal is tagged with `service.name`, `service.version`, and `deployment.environment` attributes, merged with the OTel SDK default resource (SDK version, process info, etc.) using `resource.Merge`
- Sequential error rollback — if the metric exporter fails after the trace exporter is created, the trace provider is shut down before returning the error; if the log exporter fails, both the trace and metric providers are shut down; the process never runs with a partial telemetry state

### Design Notes

- This module is Tier 1 (no micro-lib dependencies) and must never be imported by framework libraries; those libraries use only the OTel API, which defaults to no-ops until `New` is called and sets the global providers
- All three signals share a single OTLP gRPC endpoint, matching the standard Grafana LGTM stack topology where Grafana Alloy receives all signals and fans them out to Tempo, Mimir, and Loki
- The module intentionally does not implement `launcher.Component`; the returned shutdown function is deferred directly in `main`, keeping the dependency graph free of `launcher` and the interface as simple as a single function call

[0.9.0]: https://code.nochebuena.dev/go/telemetry/releases/tag/v0.9.0