Add OpenTelemetry instrumentation with middleware-only approach

pkg/greet/greet.go

@@ -16,7 +16,7 @@ func NewService() *Service {
 // Implements the Greeter interface.
 func (s *Service) Greet(ctx context.Context, name string) string {
 	log.Trace().Ctx(ctx).Str("name", name).Msg("Greet function called")
-	
+
 	if name == "" {
 		return "Hello world!"
 	}