telemetry

type Config struct {
	ServiceName    string
	ServiceVersion string
	TraceWriter    io.Writer // nil = discard (used when no OTLP endpoint)
	MetricWriter   io.Writer // nil = discard (used when Prometheus is disabled)

	// OTLP exporter settings (empty = use stdout fallback)
	OTLPEndpoint string // gRPC endpoint, e.g. "localhost:4317"
	OTLPInsecure bool   // use insecure connection (no TLS)

	// Prometheus metrics (when enabled, exposes /metrics for scraping)
	PrometheusEnabled bool
}

type Result struct {
	Shutdown          func(context.Context) error
	PrometheusHandler *prometheus.Exporter // nil when Prometheus is disabled
}