Errors: Add PrintRemovedFeatureError & PrintDeprecatedFeatureWarning (#3804)

features/feature.go

@@ -1,27 +1,12 @@
 package features
 
 import (
-	"context"
-
 	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/errors"
 )
 
-//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
-
 // Feature is the interface for Xray features. All features must implement this interface.
 // All existing features have an implementation in app directory. These features can be replaced by third-party ones.
 type Feature interface {
 	common.HasType
 	common.Runnable
 }
-
-// PrintDeprecatedFeatureWarning prints a warning for deprecated feature.
-func PrintDeprecatedFeatureWarning(feature string) {
-	errors.LogWarning(context.Background(), "You are using a deprecated feature: " + feature + ". Please update your config file(s) with latest configuration format, or update your client software.")
-}
-
-// PrintRemovedFeatureError prints an error message for removed feature. And after long enough time the message can also be removed, use as an indicator.
-func PrintRemovedFeatureError(feature string) {
-	errors.New("The feature " + feature + " is removed. Please update your config file(s) according to release notes and documentations.")
-}