feat: add headers for tracing (#4129)

Signed-off-by: Gaius <gaius.qi@gmail.com>

Author: gaius-qi

cmd/dependency/base/option.go

@@ -29,4 +29,6 @@ type TracingConfig struct {
 	Addr string `yaml:"addr" mapstructure:"addr"`
 	// ServiceName is the name of the service for tracing.
 	ServiceName string `yaml:"service-name" mapstructure:"service-name"`
+	// Headers are additional headers to be sent with tracing requests.
+	Headers map[string]string `yaml:"headers" mapstructure:"headers"`
 }

cmd/dependency/dependency.go

@@ -150,7 +150,7 @@ func initJaegerTracer(ctx context.Context, tracingConfig base.TracingConfig) (fu
 		return nil, fmt.Errorf("could not create gRPC connection to collector: %w", err)
 	}
 
-	exporter, err := otlptracegrpc.New(ctx, otlptracegrpc.WithGRPCConn(conn))
+	exporter, err := otlptracegrpc.New(ctx, otlptracegrpc.WithGRPCConn(conn), otlptracegrpc.WithHeaders(tracingConfig.Headers))
 	if err != nil {
 		return nil, fmt.Errorf("could not create trace exporter: %w", err)
 	}