Rene Nochebuena
83ac0e3900
Label each provider shutdown failure with its signal name (trace/metric/log). Errors remain joined via errors.Join; individual causes still unwrappable. Go directive bumped from 1.25 to 1.26. API committed as stable.
43 lines
3.4 KiB
Markdown
43 lines
3.4 KiB
Markdown
# Changelog
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All notable changes to this module will be documented in this file.
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The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
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and this module adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
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## [1.0.0] - 2026-05-12
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### Changed
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- Go directive bumped from 1.25 to 1.26
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- Shutdown function now wraps each provider error with a `providerErr` type that
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prefixes the signal name (`"telemetry: trace provider shutdown: …"`,
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`"telemetry: metric provider shutdown: …"`, `"telemetry: log provider shutdown: …"`).
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The combined error is still joined with `errors.Join`; individual causes remain
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unwrappable via `errors.As`. Previously, the three errors were joined without labels.
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### Stabilization
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- API committed as stable. `Config`, `New`, and the shutdown function signature
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(`func(context.Context) error`) are unchanged from v0.9.0.
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[1.0.0]: https://code.nochebuena.dev/go/telemetry/compare/v0.9.0...v1.0.0
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## [0.9.0] - 2026-03-18
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### Added
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- `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`)
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- `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
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- 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
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- 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`
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- 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
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### Design Notes
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- 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
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- 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
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- 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
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[0.9.0]: https://code.nochebuena.dev/go/telemetry/releases/tag/v0.9.0
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