diff --git a/vendor/github.com/opencord/voltha-lib-go/v4/pkg/config/common.go b/vendor/github.com/opencord/voltha-lib-go/v4/pkg/config/common.go
new file mode 100644
index 0000000..294a4bd
--- /dev/null
+++ b/vendor/github.com/opencord/voltha-lib-go/v4/pkg/config/common.go
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2020-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 (
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+)
+
+var logger log.CLogger
+
+func init() {
+	// Setup this package so that it's log level can be modified at run time
+	var err error
+	logger, err = log.RegisterPackage(log.JSON, log.ErrorLevel, log.Fields{})
+	if err != nil {
+		panic(err)
+	}
+}
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
+}
diff --git a/vendor/github.com/opencord/voltha-lib-go/v4/pkg/config/logcontroller.go b/vendor/github.com/opencord/voltha-lib-go/v4/pkg/config/logcontroller.go
new file mode 100644
index 0000000..8187edc
--- /dev/null
+++ b/vendor/github.com/opencord/voltha-lib-go/v4/pkg/config/logcontroller.go
@@ -0,0 +1,386 @@
+/*
+ * 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 provides dynamic logging configuration for specific Voltha component with loglevel lookup
+// from etcd kvstore implemented using Backend.
+// Any Voltha component can start utilizing dynamic logging by starting goroutine of StartLogLevelConfigProcessing after
+// starting kvClient for the component.
+
+package config
+
+import (
+	"context"
+	"crypto/md5"
+	"encoding/json"
+	"errors"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+	"os"
+	"sort"
+	"strings"
+)
+
+const (
+	defaultLogLevelKey                = "default"          // kvstore key containing default loglevel
+	globalConfigRootNode              = "global"           // Root Node in kvstore containing global config
+	initialGlobalDefaultLogLevelValue = "WARN"             // Hard-coded Global Default loglevel pushed at PoD startup
+	logPackagesListKey                = "log_package_list" // kvstore key containing list of allowed log packages
+)
+
+// ComponentLogController represents a Configuration for Logging Config of specific Voltha component type
+// It stores ComponentConfig and GlobalConfig of loglevel config of specific Voltha component type
+// For example,ComponentLogController instance will be created for rw-core component
+type ComponentLogController struct {
+	ComponentName       string
+	componentNameConfig *ComponentConfig
+	GlobalConfig        *ComponentConfig
+	configManager       *ConfigManager
+	logHash             [16]byte
+	initialLogLevel     string // Initial default log level set by helm chart
+}
+
+func NewComponentLogController(ctx context.Context, cm *ConfigManager) (*ComponentLogController, error) {
+	logger.Debug(ctx, "creating-new-component-log-controller")
+	componentName := os.Getenv("COMPONENT_NAME")
+	if componentName == "" {
+		return nil, errors.New("Unable to retrieve PoD Component Name from Runtime env")
+	}
+
+	var defaultLogLevel string
+	var err error
+	// Retrieve and save default log level; used for fallback if all loglevel config is cleared in etcd
+	if defaultLogLevel, err = log.LogLevelToString(log.GetDefaultLogLevel()); err != nil {
+		defaultLogLevel = "DEBUG"
+	}
+
+	return &ComponentLogController{
+		ComponentName:       componentName,
+		componentNameConfig: nil,
+		GlobalConfig:        nil,
+		configManager:       cm,
+		initialLogLevel:     defaultLogLevel,
+	}, nil
+
+}
+
+// StartLogLevelConfigProcessing initialize component config and global config
+// Then, it persists initial default Loglevels into Config Store before
+// starting the loading and processing of all Log Configuration
+func StartLogLevelConfigProcessing(cm *ConfigManager, ctx context.Context) {
+	cc, err := NewComponentLogController(ctx, cm)
+	if err != nil {
+		logger.Errorw(ctx, "unable-to-construct-component-log-controller-instance-for-log-config-monitoring", log.Fields{"error": err})
+		return
+	}
+
+	cc.GlobalConfig = cm.InitComponentConfig(globalConfigRootNode, ConfigTypeLogLevel)
+	logger.Debugw(ctx, "global-log-config", log.Fields{"cc-global-config": cc.GlobalConfig})
+
+	cc.componentNameConfig = cm.InitComponentConfig(cc.ComponentName, ConfigTypeLogLevel)
+	logger.Debugw(ctx, "component-log-config", log.Fields{"cc-component-name-config": cc.componentNameConfig})
+
+	cc.persistInitialDefaultLogConfigs(ctx)
+
+	cc.persistRegisteredLogPackageList(ctx)
+
+	cc.processLogConfig(ctx)
+}
+
+// Method to persist Global default loglevel into etcd, if not set yet
+// It also checks and set Component default loglevel into etcd with initial loglevel set from command line
+func (c *ComponentLogController) persistInitialDefaultLogConfigs(ctx context.Context) {
+
+	_, err := c.GlobalConfig.Retrieve(ctx, defaultLogLevelKey)
+	if err != nil {
+		logger.Debugw(ctx, "failed-to-retrieve-global-default-log-config-at-startup", log.Fields{"error": err})
+
+		err = c.GlobalConfig.Save(ctx, defaultLogLevelKey, initialGlobalDefaultLogLevelValue)
+		if err != nil {
+			logger.Errorw(ctx, "failed-to-persist-global-default-log-config-at-startup", log.Fields{"error": err, "loglevel": initialGlobalDefaultLogLevelValue})
+		}
+	}
+
+	_, err = c.componentNameConfig.Retrieve(ctx, defaultLogLevelKey)
+	if err != nil {
+		logger.Debugw(ctx, "failed-to-retrieve-component-default-log-config-at-startup", log.Fields{"error": err})
+
+		err = c.componentNameConfig.Save(ctx, defaultLogLevelKey, c.initialLogLevel)
+		if err != nil {
+			logger.Errorw(ctx, "failed-to-persist-component-default-log-config-at-startup", log.Fields{"error": err, "loglevel": c.initialLogLevel})
+		}
+	}
+}
+
+// Method to save list of all registered packages for component into config kvstore. A single string
+// is constructed with comma-separated package names in sorted order and persisted
+func (c *ComponentLogController) persistRegisteredLogPackageList(ctx context.Context) {
+
+	componentMetadataConfig := c.configManager.InitComponentConfig(c.ComponentName, ConfigTypeMetadata)
+	logger.Debugw(ctx, "component-metadata-config", log.Fields{"component-metadata-config": componentMetadataConfig})
+
+	packageList := log.GetPackageNames()
+	packageList = append(packageList, defaultLogLevelKey)
+	sort.Strings(packageList)
+
+	packageNames, err := json.Marshal(packageList)
+	if err != nil {
+		logger.Errorw(ctx, "failed-to-marshal-log-package-list-for-storage", log.Fields{"error": err, "packageList": packageList})
+		return
+	}
+
+	if err := componentMetadataConfig.Save(ctx, logPackagesListKey, string(packageNames)); err != nil {
+		logger.Errorw(ctx, "failed-to-persist-component-registered-log-package-list-at-startup", log.Fields{"error": err, "packageNames": packageNames})
+	}
+}
+
+// ProcessLogConfig will first load and apply log config and then start waiting on component config and global config
+// channels for any changes. Event channel will be recieved from Backend for valid change type
+// Then data for componentn log config and global log config will be retrieved from Backend and stored in updatedLogConfig in precedence order
+// If any changes in updatedLogConfig will be applied on component
+func (c *ComponentLogController) processLogConfig(ctx context.Context) {
+
+	// Load and apply Log Config for first time
+	initialLogConfig, err := c.buildUpdatedLogConfig(ctx)
+	if err != nil {
+		logger.Warnw(ctx, "unable-to-load-log-config-at-startup", log.Fields{"error": err})
+	} else {
+		if err := c.loadAndApplyLogConfig(ctx, initialLogConfig); err != nil {
+			logger.Warnw(ctx, "unable-to-apply-log-config-at-startup", log.Fields{"error": err})
+		}
+	}
+
+	componentConfigEventChan := c.componentNameConfig.MonitorForConfigChange(ctx)
+
+	globalConfigEventChan := c.GlobalConfig.MonitorForConfigChange(ctx)
+
+	// process the events for componentName and  global config
+	var configEvent *ConfigChangeEvent
+	for {
+		select {
+		case configEvent = <-globalConfigEventChan:
+		case configEvent = <-componentConfigEventChan:
+
+		}
+		logger.Debugw(ctx, "processing-log-config-change", log.Fields{"ChangeType": configEvent.ChangeType, "Package": configEvent.ConfigAttribute})
+
+		updatedLogConfig, err := c.buildUpdatedLogConfig(ctx)
+		if err != nil {
+			logger.Warnw(ctx, "unable-to-fetch-updated-log-config", log.Fields{"error": err})
+			continue
+		}
+
+		logger.Debugw(ctx, "applying-updated-log-config", log.Fields{"updated-log-config": updatedLogConfig})
+
+		if err := c.loadAndApplyLogConfig(ctx, updatedLogConfig); err != nil {
+			logger.Warnw(ctx, "unable-to-load-and-apply-log-config", log.Fields{"error": err})
+		}
+	}
+
+}
+
+// get active loglevel from the zap logger
+func getActiveLogLevels(ctx context.Context) map[string]string {
+	loglevels := make(map[string]string)
+
+	// now do the default log level
+	if level, err := log.LogLevelToString(log.GetDefaultLogLevel()); err == nil {
+		loglevels[defaultLogLevelKey] = level
+	}
+
+	// do the per-package log levels
+	for _, packageName := range log.GetPackageNames() {
+		level, err := log.GetPackageLogLevel(packageName)
+		if err != nil {
+			logger.Warnw(ctx, "unable-to-fetch-current-active-loglevel-for-package-name", log.Fields{"package-name": packageName, "error": err})
+			continue
+		}
+
+		if l, err := log.LogLevelToString(level); err == nil {
+			loglevels[packageName] = l
+		}
+	}
+
+	logger.Debugw(ctx, "retreived-log-levels-from-zap-logger", log.Fields{"loglevels": loglevels})
+
+	return loglevels
+}
+
+func (c *ComponentLogController) getGlobalLogConfig(ctx context.Context) (string, error) {
+
+	globalDefaultLogLevel, err := c.GlobalConfig.Retrieve(ctx, defaultLogLevelKey)
+	if err != nil {
+		return "", err
+	}
+
+	// Handle edge cases when global default loglevel is deleted directly from etcd or set to a invalid value
+	// We should use hard-coded initial default value in such cases
+	if globalDefaultLogLevel == "" {
+		logger.Warn(ctx, "global-default-loglevel-not-found-in-config-store")
+		globalDefaultLogLevel = initialGlobalDefaultLogLevelValue
+	}
+
+	if _, err := log.StringToLogLevel(globalDefaultLogLevel); err != nil {
+		logger.Warnw(ctx, "unsupported-loglevel-config-defined-at-global-default", log.Fields{"log-level": globalDefaultLogLevel})
+		globalDefaultLogLevel = initialGlobalDefaultLogLevelValue
+	}
+
+	logger.Debugw(ctx, "retrieved-global-default-loglevel", log.Fields{"level": globalDefaultLogLevel})
+
+	return globalDefaultLogLevel, nil
+}
+
+func (c *ComponentLogController) getComponentLogConfig(ctx context.Context, globalDefaultLogLevel string) (map[string]string, error) {
+	componentLogConfig, err := c.componentNameConfig.RetrieveAll(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	effectiveDefaultLogLevel := ""
+	for logConfigKey, logConfigValue := range componentLogConfig {
+		if _, err := log.StringToLogLevel(logConfigValue); err != nil || logConfigKey == "" {
+			logger.Warnw(ctx, "unsupported-loglevel-config-defined-at-component-context", log.Fields{"package-name": logConfigKey, "log-level": logConfigValue})
+			delete(componentLogConfig, logConfigKey)
+		} else {
+			if logConfigKey == defaultLogLevelKey {
+				effectiveDefaultLogLevel = componentLogConfig[defaultLogLevelKey]
+			}
+		}
+	}
+
+	// if default loglevel is not configured for the component, component should use
+	// default loglevel configured at global level
+	if effectiveDefaultLogLevel == "" {
+		effectiveDefaultLogLevel = globalDefaultLogLevel
+	}
+
+	componentLogConfig[defaultLogLevelKey] = effectiveDefaultLogLevel
+
+	logger.Debugw(ctx, "retrieved-component-log-config", log.Fields{"component-log-level": componentLogConfig})
+
+	return componentLogConfig, nil
+}
+
+// buildUpdatedLogConfig retrieve the global logConfig and component logConfig  from Backend
+// component logConfig stores the log config with precedence order
+// For example, If the global logConfig is set and component logConfig is set only for specific package then
+// component logConfig is stored with global logConfig  and component logConfig of specific package
+// For example, If the global logConfig is set and component logConfig is set for specific package and as well as for default then
+// component logConfig is stored with  component logConfig data only
+func (c *ComponentLogController) buildUpdatedLogConfig(ctx context.Context) (map[string]string, error) {
+	globalLogLevel, err := c.getGlobalLogConfig(ctx)
+	if err != nil {
+		logger.Errorw(ctx, "unable-to-retrieve-global-log-config", log.Fields{"err": err})
+	}
+
+	componentLogConfig, err := c.getComponentLogConfig(ctx, globalLogLevel)
+	if err != nil {
+		return nil, err
+	}
+
+	finalLogConfig := make(map[string]string)
+	for packageName, logLevel := range componentLogConfig {
+		finalLogConfig[strings.ReplaceAll(packageName, "#", "/")] = logLevel
+	}
+
+	return finalLogConfig, nil
+}
+
+// load and apply the current configuration for component name
+// create hash of loaded configuration using GenerateLogConfigHash
+// if there is previous hash stored, compare the hash to stored hash
+// if there is any change will call UpdateLogLevels
+func (c *ComponentLogController) loadAndApplyLogConfig(ctx context.Context, logConfig map[string]string) error {
+	currentLogHash, err := GenerateLogConfigHash(logConfig)
+	if err != nil {
+		return err
+	}
+
+	if c.logHash != currentLogHash {
+		updateLogLevels(ctx, logConfig)
+		c.logHash = currentLogHash
+	} else {
+		logger.Debug(ctx, "effective-loglevel-config-same-as-currently-active")
+	}
+
+	return nil
+}
+
+// createModifiedLogLevels loops through the activeLogLevels recieved from zap logger and updatedLogLevels recieved from buildUpdatedLogConfig
+// to identify and create map of modified Log Levels of 2 types:
+// - Packages for which log level has been changed
+// - Packages for which log level config has been cleared - set to default log level
+func createModifiedLogLevels(ctx context.Context, activeLogLevels, updatedLogLevels map[string]string) map[string]string {
+	defaultLevel := updatedLogLevels[defaultLogLevelKey]
+
+	modifiedLogLevels := make(map[string]string)
+	for activeKey, activeLevel := range activeLogLevels {
+		if _, exist := updatedLogLevels[activeKey]; !exist {
+			if activeLevel != defaultLevel {
+				modifiedLogLevels[activeKey] = defaultLevel
+			}
+		} else if activeLevel != updatedLogLevels[activeKey] {
+			modifiedLogLevels[activeKey] = updatedLogLevels[activeKey]
+		}
+	}
+
+	// Log warnings for all invalid packages for which log config has been set
+	for key, value := range updatedLogLevels {
+		if _, exist := activeLogLevels[key]; !exist {
+			logger.Warnw(ctx, "ignoring-loglevel-set-for-invalid-package", log.Fields{"package": key, "log-level": value})
+		}
+	}
+
+	return modifiedLogLevels
+}
+
+// updateLogLevels update the loglevels for the component
+// retrieve active confguration from logger
+// compare with entries one by one and apply
+func updateLogLevels(ctx context.Context, updatedLogConfig map[string]string) {
+
+	activeLogLevels := getActiveLogLevels(ctx)
+	changedLogLevels := createModifiedLogLevels(ctx, activeLogLevels, updatedLogConfig)
+
+	// If no changed log levels are found, just return. It may happen on configuration of a invalid package
+	if len(changedLogLevels) == 0 {
+		logger.Debug(ctx, "no-change-in-effective-loglevel-config")
+		return
+	}
+
+	logger.Debugw(ctx, "applying-log-level-for-modified-packages", log.Fields{"changed-log-levels": changedLogLevels})
+	for key, level := range changedLogLevels {
+		if key == defaultLogLevelKey {
+			if l, err := log.StringToLogLevel(level); err == nil {
+				log.SetDefaultLogLevel(l)
+			}
+		} else {
+			if l, err := log.StringToLogLevel(level); err == nil {
+				log.SetPackageLogLevel(key, l)
+			}
+		}
+	}
+}
+
+// generate md5 hash of key value pairs appended into a single string
+// in order by key name
+func GenerateLogConfigHash(createHashLog map[string]string) ([16]byte, error) {
+	createHashLogBytes := []byte{}
+	levelData, err := json.Marshal(createHashLog)
+	if err != nil {
+		return [16]byte{}, err
+	}
+	createHashLogBytes = append(createHashLogBytes, levelData...)
+	return md5.Sum(createHashLogBytes), nil
+}
diff --git a/vendor/github.com/opencord/voltha-lib-go/v4/pkg/config/logfeaturescontroller.go b/vendor/github.com/opencord/voltha-lib-go/v4/pkg/config/logfeaturescontroller.go
new file mode 100644
index 0000000..353ae5c
--- /dev/null
+++ b/vendor/github.com/opencord/voltha-lib-go/v4/pkg/config/logfeaturescontroller.go
@@ -0,0 +1,172 @@
+/*
+ * 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"
+	"errors"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+	"os"
+	"strings"
+)
+
+const (
+	defaultTracingStatusKey        = "trace_publish"   // kvstore key containing tracing configuration status
+	defaultLogCorrelationStatusKey = "log_correlation" // kvstore key containing log correlation configuration status
+)
+
+// ComponentLogFeatureController represents Configuration for Logging related features of Tracing and Log
+// Correlation of specific Voltha component.
+type ComponentLogFeaturesController struct {
+	ComponentName               string
+	componentNameConfig         *ComponentConfig
+	configManager               *ConfigManager
+	initialTracingStatus        bool // Initial default tracing status set by helm chart
+	initialLogCorrelationStatus bool // Initial default log correlation status set by helm chart
+}
+
+func NewComponentLogFeaturesController(ctx context.Context, cm *ConfigManager) (*ComponentLogFeaturesController, error) {
+	logger.Debug(ctx, "creating-new-component-log-features-controller")
+	componentName := os.Getenv("COMPONENT_NAME")
+	if componentName == "" {
+		return nil, errors.New("Unable to retrieve PoD Component Name from Runtime env")
+	}
+
+	tracingStatus := log.GetGlobalLFM().GetTracePublishingStatus()
+	logCorrelationStatus := log.GetGlobalLFM().GetLogCorrelationStatus()
+
+	return &ComponentLogFeaturesController{
+		ComponentName:               componentName,
+		componentNameConfig:         nil,
+		configManager:               cm,
+		initialTracingStatus:        tracingStatus,
+		initialLogCorrelationStatus: logCorrelationStatus,
+	}, nil
+
+}
+
+// StartLogFeaturesConfigProcessing persists initial config of Log Features into Config Store before
+// starting the loading and processing of Configuration updates
+func StartLogFeaturesConfigProcessing(cm *ConfigManager, ctx context.Context) {
+	cc, err := NewComponentLogFeaturesController(ctx, cm)
+	if err != nil {
+		logger.Errorw(ctx, "unable-to-construct-component-log-features-controller-instance-for-monitoring", log.Fields{"error": err})
+		return
+	}
+
+	cc.componentNameConfig = cm.InitComponentConfig(cc.ComponentName, ConfigTypeLogFeatures)
+	logger.Debugw(ctx, "component-log-features-config", log.Fields{"cc-component-name-config": cc.componentNameConfig})
+
+	cc.persistInitialLogFeaturesConfigs(ctx)
+
+	cc.processLogFeaturesConfig(ctx)
+}
+
+// Method to persist Initial status of Log Correlation and Tracing features (as set from command line)
+// into config store (etcd kvstore), if not set yet
+func (cc *ComponentLogFeaturesController) persistInitialLogFeaturesConfigs(ctx context.Context) {
+
+	_, err := cc.componentNameConfig.Retrieve(ctx, defaultTracingStatusKey)
+	if err != nil {
+		statusString := "DISABLED"
+		if cc.initialTracingStatus {
+			statusString = "ENABLED"
+		}
+		err = cc.componentNameConfig.Save(ctx, defaultTracingStatusKey, statusString)
+		if err != nil {
+			logger.Errorw(ctx, "failed-to-persist-component-initial-tracing-status-at-startup", log.Fields{"error": err, "tracingstatus": statusString})
+		}
+	}
+
+	_, err = cc.componentNameConfig.Retrieve(ctx, defaultLogCorrelationStatusKey)
+	if err != nil {
+		statusString := "DISABLED"
+		if cc.initialLogCorrelationStatus {
+			statusString = "ENABLED"
+		}
+		err = cc.componentNameConfig.Save(ctx, defaultLogCorrelationStatusKey, statusString)
+		if err != nil {
+			logger.Errorw(ctx, "failed-to-persist-component-initial-log-correlation-status-at-startup", log.Fields{"error": err, "logcorrelationstatus": statusString})
+		}
+	}
+}
+
+// processLogFeaturesConfig will first load and apply configuration of log features. Then it will start waiting for any changes
+// made to configuration in config store (etcd) and apply the same
+func (cc *ComponentLogFeaturesController) processLogFeaturesConfig(ctx context.Context) {
+
+	// Load and apply Tracing Status and log correlation status for first time
+	cc.loadAndApplyTracingStatusUpdate(ctx)
+	cc.loadAndApplyLogCorrelationStatusUpdate(ctx)
+
+	componentConfigEventChan := cc.componentNameConfig.MonitorForConfigChange(ctx)
+
+	// process the change events received on the channel
+	var configEvent *ConfigChangeEvent
+	for {
+		select {
+		case <-ctx.Done():
+			return
+
+		case configEvent = <-componentConfigEventChan:
+			logger.Debugw(ctx, "processing-log-features-config-change", log.Fields{"ChangeType": configEvent.ChangeType, "Package": configEvent.ConfigAttribute})
+
+			if strings.HasSuffix(configEvent.ConfigAttribute, defaultTracingStatusKey) {
+				cc.loadAndApplyTracingStatusUpdate(ctx)
+			} else if strings.HasSuffix(configEvent.ConfigAttribute, defaultLogCorrelationStatusKey) {
+				cc.loadAndApplyLogCorrelationStatusUpdate(ctx)
+			}
+		}
+	}
+
+}
+
+func (cc *ComponentLogFeaturesController) loadAndApplyTracingStatusUpdate(ctx context.Context) {
+
+	desiredTracingStatus, err := cc.componentNameConfig.Retrieve(ctx, defaultTracingStatusKey)
+	if err != nil || desiredTracingStatus == "" {
+		logger.Warn(ctx, "unable-to-retrieve-tracing-status-from-config-store")
+		return
+	}
+
+	if desiredTracingStatus != "ENABLED" && desiredTracingStatus != "DISABLED" {
+		logger.Warnw(ctx, "unsupported-tracing-status-configured-in-config-store", log.Fields{"failed-tracing-status": desiredTracingStatus, "tracing-status": log.GetGlobalLFM().GetTracePublishingStatus()})
+		return
+	}
+
+	logger.Debugw(ctx, "retrieved-tracing-status", log.Fields{"tracing-status": desiredTracingStatus})
+
+	log.GetGlobalLFM().SetTracePublishingStatus(desiredTracingStatus == "ENABLED")
+}
+
+func (cc *ComponentLogFeaturesController) loadAndApplyLogCorrelationStatusUpdate(ctx context.Context) {
+
+	desiredLogCorrelationStatus, err := cc.componentNameConfig.Retrieve(ctx, defaultLogCorrelationStatusKey)
+	if err != nil || desiredLogCorrelationStatus == "" {
+		logger.Warn(ctx, "unable-to-retrieve-log-correlation-status-from-config-store")
+		return
+	}
+
+	if desiredLogCorrelationStatus != "ENABLED" && desiredLogCorrelationStatus != "DISABLED" {
+		logger.Warnw(ctx, "unsupported-log-correlation-status-configured-in-config-store", log.Fields{"failed-log-correlation-status": desiredLogCorrelationStatus, "log-correlation-status": log.GetGlobalLFM().GetLogCorrelationStatus()})
+		return
+	}
+
+	logger.Debugw(ctx, "retrieved-log-correlation-status", log.Fields{"log-correlation-status": desiredLogCorrelationStatus})
+
+	log.GetGlobalLFM().SetLogCorrelationStatus(desiredLogCorrelationStatus == "ENABLED")
+}