diff --git a/vendor/github.com/opencord/voltha-lib-go/v4/pkg/config/configmanager.go b/vendor/github.com/opencord/voltha-lib-go/v4/pkg/config/configmanager.go
new file mode 100644
index 0000000..4b1c841
--- /dev/null
+++ b/vendor/github.com/opencord/voltha-lib-go/v4/pkg/config/configmanager.go
@@ -0,0 +1,284 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package config
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/opencord/voltha-lib-go/v4/pkg/db"
+	"github.com/opencord/voltha-lib-go/v4/pkg/db/kvstore"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+)
+
+const (
+	defaultkvStoreConfigPath     = "config"
+	defaultkvStoreDataPathPrefix = "service/voltha"
+	kvStorePathSeparator         = "/"
+)
+
+// ConfigType represents the type for which config is created inside the kvstore
+// For example, loglevel
+type ConfigType int
+
+const (
+	ConfigTypeLogLevel ConfigType = iota
+	ConfigTypeMetadata
+	ConfigTypeKafka
+	ConfigTypeLogFeatures
+)
+
+func (c ConfigType) String() string {
+	return [...]string{"loglevel", "metadata", "kafka", "logfeatures"}[c]
+}
+
+// ChangeEvent represents the event recieved from watch
+// For example, Put Event
+type ChangeEvent int
+
+const (
+	Put ChangeEvent = iota
+	Delete
+)
+
+func (ce ChangeEvent) String() string {
+	return [...]string{"Put", "Delete"}[ce]
+}
+
+// ConfigChangeEvent represents config for the events recieved from watch
+// For example,ChangeType is Put ,ConfigAttribute default
+type ConfigChangeEvent struct {
+	ChangeType      ChangeEvent
+	ConfigAttribute string
+}
+
+// ConfigManager is a wrapper over Backend to maintain Configuration of voltha components
+// in kvstore based persistent storage
+type ConfigManager struct {
+	Backend               *db.Backend
+	KVStoreConfigPrefix   string
+	KVStoreDataPathPrefix string
+}
+
+// ComponentConfig represents a category of configuration for a specific VOLTHA component type
+// stored in a persistent storage pointed to by Config Manager
+// For example, one ComponentConfig instance will be created for loglevel config type for rw-core
+// component while another ComponentConfig instance will refer to connection config type for same
+// rw-core component. So, there can be multiple ComponentConfig instance created per component
+// pointing to different category of configuration.
+//
+// Configuration pointed to be by ComponentConfig is stored in kvstore as a list of key/value pairs
+// under the hierarchical tree with following base path
+// <Backend Prefix Path>/<Config Prefix>/<Component Name>/<Config Type>/
+//
+// For example, rw-core ComponentConfig for loglevel config entries will be stored under following path
+// /voltha/service/config/rw-core/loglevel/
+type ComponentConfig struct {
+	cManager         *ConfigManager
+	componentLabel   string
+	configType       ConfigType
+	changeEventChan  chan *ConfigChangeEvent
+	kvStoreEventChan chan *kvstore.Event
+}
+
+func NewConfigManager(ctx context.Context, kvClient kvstore.Client, kvStoreType, kvStoreAddress string, kvStoreTimeout time.Duration) *ConfigManager {
+	var kvStorePrefix string
+	if prefix, present := os.LookupEnv("KV_STORE_DATAPATH_PREFIX"); present {
+		kvStorePrefix = prefix
+		logger.Infow(ctx, "KV_STORE_DATAPATH_PREFIX env variable is set, ", log.Fields{"kvStoreDataPathPrefix": kvStorePrefix})
+	} else {
+		kvStorePrefix = defaultkvStoreDataPathPrefix
+		logger.Infow(ctx, "KV_STORE_DATAPATH_PREFIX env variable is not set, using default", log.Fields{"kvStoreDataPathPrefix": defaultkvStoreDataPathPrefix})
+	}
+	return &ConfigManager{
+		KVStoreConfigPrefix:   defaultkvStoreConfigPath,
+		KVStoreDataPathPrefix: kvStorePrefix,
+		Backend: &db.Backend{
+			Client:     kvClient,
+			StoreType:  kvStoreType,
+			Address:    kvStoreAddress,
+			Timeout:    kvStoreTimeout,
+			PathPrefix: kvStorePrefix,
+		},
+	}
+}
+
+// RetrieveComponentList list the component Names for which loglevel is stored in kvstore
+func (c *ConfigManager) RetrieveComponentList(ctx context.Context, configType ConfigType) ([]string, error) {
+	data, err := c.Backend.List(ctx, c.KVStoreConfigPrefix)
+	if err != nil {
+		return nil, err
+	}
+
+	// Looping through the data recieved from the Backend for config
+	// Trimming and Splitting the required key and value from data and  storing as componentName,PackageName and Level
+	// For Example, recieved key would be <Backend Prefix Path>/<Config Prefix>/<Component Name>/<Config Type>/default and value \"DEBUG\"
+	// Then in default will be stored as PackageName,componentName as <Component Name> and DEBUG will be stored as value in List struct
+	ccPathPrefix := kvStorePathSeparator + configType.String() + kvStorePathSeparator
+	pathPrefix := c.KVStoreDataPathPrefix + kvStorePathSeparator + c.KVStoreConfigPrefix + kvStorePathSeparator
+	var list []string
+	keys := make(map[string]interface{})
+	for attr := range data {
+		cname := strings.TrimPrefix(attr, pathPrefix)
+		cName := strings.SplitN(cname, ccPathPrefix, 2)
+		if len(cName) != 2 {
+			continue
+		}
+		if _, exist := keys[cName[0]]; !exist {
+			keys[cName[0]] = nil
+			list = append(list, cName[0])
+		}
+	}
+	return list, nil
+}
+
+// Initialize the component config
+func (cm *ConfigManager) InitComponentConfig(componentLabel string, configType ConfigType) *ComponentConfig {
+
+	return &ComponentConfig{
+		componentLabel:   componentLabel,
+		configType:       configType,
+		cManager:         cm,
+		changeEventChan:  nil,
+		kvStoreEventChan: nil,
+	}
+
+}
+
+func (c *ComponentConfig) makeConfigPath() string {
+
+	cType := c.configType.String()
+	return c.cManager.KVStoreConfigPrefix + kvStorePathSeparator +
+		c.componentLabel + kvStorePathSeparator + cType
+}
+
+// MonitorForConfigChange watch on the subkeys for the given key
+// Any changes to the subkeys for the given key will return an event channel
+// Then Event channel will be processed and  new event channel with required values will be created and return
+// For example, rw-core will be watching on <Backend Prefix Path>/<Config Prefix>/<Component Name>/<Config Type>/
+// will return an event channel for PUT,DELETE eventType.
+// Then values from event channel will be processed and  stored in kvStoreEventChan.
+func (c *ComponentConfig) MonitorForConfigChange(ctx context.Context) chan *ConfigChangeEvent {
+	key := c.makeConfigPath()
+
+	logger.Debugw(ctx, "monitoring-for-config-change", log.Fields{"key": key})
+
+	c.changeEventChan = make(chan *ConfigChangeEvent, 1)
+
+	c.kvStoreEventChan = c.cManager.Backend.CreateWatch(ctx, key, true)
+
+	go c.processKVStoreWatchEvents(ctx)
+
+	return c.changeEventChan
+}
+
+// processKVStoreWatchEvents process event channel recieved from the Backend for any ChangeType
+// It checks for the EventType is valid or not.For the valid EventTypes creates ConfigChangeEvent and send it on channel
+func (c *ComponentConfig) processKVStoreWatchEvents(ctx context.Context) {
+
+	ccKeyPrefix := c.makeConfigPath()
+
+	logger.Debugw(ctx, "processing-kvstore-event-change", log.Fields{"key-prefix": ccKeyPrefix})
+
+	ccPathPrefix := c.cManager.Backend.PathPrefix + ccKeyPrefix + kvStorePathSeparator
+
+	for watchResp := range c.kvStoreEventChan {
+
+		if watchResp.EventType == kvstore.CONNECTIONDOWN || watchResp.EventType == kvstore.UNKNOWN {
+			logger.Warnw(ctx, "received-invalid-change-type-in-watch-channel-from-kvstore", log.Fields{"change-type": watchResp.EventType})
+			continue
+		}
+
+		// populating the configAttribute from the received Key
+		// For Example, Key received would be <Backend Prefix Path>/<Config Prefix>/<Component Name>/<Config Type>/default
+		// Storing default in configAttribute variable
+		ky := fmt.Sprintf("%s", watchResp.Key)
+
+		c.changeEventChan <- &ConfigChangeEvent{
+			ChangeType:      ChangeEvent(watchResp.EventType),
+			ConfigAttribute: strings.TrimPrefix(ky, ccPathPrefix),
+		}
+	}
+}
+
+// Retrieves value of a specific config key. Value of key is returned in String format
+func (c *ComponentConfig) Retrieve(ctx context.Context, configKey string) (string, error) {
+	key := c.makeConfigPath() + "/" + configKey
+
+	logger.Debugw(ctx, "retrieving-config", log.Fields{"key": key})
+
+	if kvpair, err := c.cManager.Backend.Get(ctx, key); err != nil {
+		return "", err
+	} else {
+		if kvpair == nil {
+			return "", fmt.Errorf("config-key-does-not-exist : %s", key)
+		}
+
+		value := strings.Trim(fmt.Sprintf("%s", kvpair.Value), "\"")
+		logger.Debugw(ctx, "retrieved-config", log.Fields{"key": key, "value": value})
+		return value, nil
+	}
+}
+
+func (c *ComponentConfig) RetrieveAll(ctx context.Context) (map[string]string, error) {
+	key := c.makeConfigPath()
+
+	logger.Debugw(ctx, "retreiving-list", log.Fields{"key": key})
+
+	data, err := c.cManager.Backend.List(ctx, key)
+	if err != nil {
+		return nil, err
+	}
+
+	// Looping through the data recieved from the Backend for the given key
+	// Trimming the required key and value from data and  storing as key/value pair
+	// For Example, recieved key would be <Backend Prefix Path>/<Config Prefix>/<Component Name>/<Config Type>/default and value \"DEBUG\"
+	// Then in default will be stored as key and DEBUG will be stored as value in map[string]string
+	res := make(map[string]string)
+	ccPathPrefix := c.cManager.Backend.PathPrefix + kvStorePathSeparator + key + kvStorePathSeparator
+	for attr, val := range data {
+		res[strings.TrimPrefix(attr, ccPathPrefix)] = strings.Trim(fmt.Sprintf("%s", val.Value), "\"")
+	}
+
+	return res, nil
+}
+
+func (c *ComponentConfig) Save(ctx context.Context, configKey string, configValue string) error {
+	key := c.makeConfigPath() + "/" + configKey
+
+	logger.Debugw(ctx, "saving-config", log.Fields{"key": key, "value": configValue})
+
+	//save the data for update config
+	if err := c.cManager.Backend.Put(ctx, key, configValue); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (c *ComponentConfig) Delete(ctx context.Context, configKey string) error {
+	//construct key using makeConfigPath
+	key := c.makeConfigPath() + "/" + configKey
+
+	logger.Debugw(ctx, "deleting-config", log.Fields{"key": key})
+	//delete the config
+	if err := c.cManager.Backend.Delete(ctx, key); err != nil {
+		return err
+	}
+	return nil
+}