Add OpenTelemetry instrumentation with middleware-only approach

pkg/greet/api_v1.go

@@ -45,4 +45,4 @@ func (h *apiV1GreetHandler) handleGreetPath(w http.ResponseWriter, r *http.Reque
 func (h *apiV1GreetHandler) writeJSONResponse(w http.ResponseWriter, message string) {
 	w.Header().Set("Content-Type", "application/json")
 	json.NewEncoder(w).Encode(map[string]string{"message": message})
-}
+}

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!"
 	}

pkg/greet/greet_test.go

@@ -25,4 +25,4 @@ func TestService_Greet(t *testing.T) {
 			}
 		})
 	}
-}
+}