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
+}