Add RetryConfig for OtelTracer

Signed-off-by: Asai Neko <sugar@sne.moe>

tracer/otel_tracer.go

@@ -34,10 +34,22 @@ func Init(ctx context.Context) func(context.Context) error {
 		slog.Error("[OTEL] Failed to create resource", "err", err)
 	}
 
-	traceExporter, _ := otlptracegrpc.New(ctx,
+	retryConfig := otlptracegrpc.RetryConfig{
+		Enabled:         true,
+		InitialInterval: 1 * time.Second,
+		MaxInterval:     10 * time.Second,
+	}
+
+	// Trace Exporter
+	traceExporter, err := otlptracegrpc.New(ctx,
 		otlptracegrpc.WithEndpoint(endpoint),
 		otlptracegrpc.WithInsecure(),
+		otlptracegrpc.WithRetry(retryConfig),
 	)
+	if err != nil {
+		slog.Error("[OTEL] Failed to create trace exporter", "err", err)
+	}
+
 	tp := sdktrace.NewTracerProvider(
 		sdktrace.WithBatcher(traceExporter),
 		sdktrace.WithResource(res),
@@ -45,10 +57,16 @@ func Init(ctx context.Context) func(context.Context) error {
 	)
 	otel.SetTracerProvider(tp)
 
-	metricExporter, _ := otlpmetricgrpc.New(ctx,
+	// Metric Exporter
+	metricExporter, err := otlpmetricgrpc.New(ctx,
 		otlpmetricgrpc.WithEndpoint(endpoint),
 		otlpmetricgrpc.WithInsecure(),
+		otlpmetricgrpc.WithRetry(otlpmetricgrpc.RetryConfig(retryConfig)),
 	)
+	if err != nil {
+		slog.Error("[OTEL] Failed to create metric exporter", "err", err)
+	}
+
 	mp := sdkmetric.NewMeterProvider(
 		sdkmetric.WithResource(res),
 		sdkmetric.WithReader(sdkmetric.NewPeriodicReader(metricExporter,
@@ -56,10 +74,16 @@ func Init(ctx context.Context) func(context.Context) error {
 	)
 	otel.SetMeterProvider(mp)
 
-	logExporter, _ := otlploggrpc.New(ctx,
+	// Log Exporter
+	logExporter, err := otlploggrpc.New(ctx,
 		otlploggrpc.WithEndpoint(endpoint),
 		otlploggrpc.WithInsecure(),
+		otlploggrpc.WithRetry(otlploggrpc.RetryConfig(retryConfig)),
 	)
+	if err != nil {
+		slog.Error("[OTEL] Failed to create log exporter", "err", err)
+	}
+
 	lp := sdklog.NewLoggerProvider(
 		sdklog.WithResource(res),
 		sdklog.WithProcessor(sdklog.NewBatchProcessor(logExporter)),