diff --git a/agent/api/container/container.go b/agent/api/container/container.go
index d72094f1672..98d8f701c2f 100644
--- a/agent/api/container/container.go
+++ b/agent/api/container/container.go
@@ -27,6 +27,7 @@ import (
 	resourcestatus "github.com/aws/amazon-ecs-agent/agent/taskresource/status"
 	"github.com/aws/amazon-ecs-agent/ecs-agent/credentials"
 	"github.com/aws/amazon-ecs-agent/ecs-agent/logger"
+	"github.com/aws/amazon-ecs-agent/ecs-agent/logger/field"
 
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/cihub/seelog"
@@ -516,11 +517,11 @@ func (c *Container) Fields() logger.Fields {
 		exitCode = strconv.Itoa(*c.GetKnownExitCode())
 	}
 	return logger.Fields{
-		"containerName":          c.Name,
-		"containerImage":         c.Image,
+		field.ContainerName:      c.Name,
+		field.ContainerImage:     c.Image,
 		"containerKnownStatus":   c.GetKnownStatus().String(),
 		"containerDesiredStatus": c.GetDesiredStatus().String(),
-		"containerExitCode":      exitCode,
+		field.ContainerExitCode:  exitCode,
 	}
 }
 
diff --git a/agent/engine/docker_image_manager.go b/agent/engine/docker_image_manager.go
index 3daf4838dec..af61b66ea4c 100644
--- a/agent/engine/docker_image_manager.go
+++ b/agent/engine/docker_image_manager.go
@@ -152,7 +152,7 @@ func (imageManager *dockerImageManager) RecordContainerReference(container *apic
 	imageInspected, err := imageManager.client.InspectImage(container.Image)
 	if err != nil {
 		fields := container.Fields()
-		fields["err"] = err
+		fields[field.Error] = err
 		logger.Error("Error inspecting image", fields)
 		return err
 	}
@@ -488,16 +488,16 @@ func (imageManager *dockerImageManager) removeNonECSImages(ctx context.Context,
 			continue
 		}
 		fields := logger.Fields{
-			"imageID":        image.ImageID,
-			"imageSizeBytes": image.Size,
-			"repoTags":       image.RepoTags,
+			field.ImageID:        image.ImageID,
+			field.ImageSizeBytes: image.Size,
+			"repoTags":           image.RepoTags,
 		}
 		if len(image.RepoTags) > 1 {
 			logger.Debug("Non-ECS image has more than one tag", fields)
 			for _, tag := range image.RepoTags {
 				err := imageManager.client.RemoveImage(ctx, tag, dockerclient.RemoveImageTimeout)
 				if err != nil {
-					logger.Error("Error removing non-ECS RepoTag", fields, logger.Fields{"err": err})
+					logger.Error("Error removing non-ECS RepoTag", fields, logger.Fields{field.Error: err})
 				} else {
 					logger.Info("Non-ECS image tag removed", fields, logger.Fields{"imageTag": tag})
 					numImagesAlreadyDeleted++
@@ -507,7 +507,7 @@ func (imageManager *dockerImageManager) removeNonECSImages(ctx context.Context,
 			logger.Debug("Removing non-ECS image", fields)
 			err := imageManager.client.RemoveImage(ctx, image.ImageID, dockerclient.RemoveImageTimeout)
 			if err != nil {
-				logger.Error("Error removing non-ECS image", fields, logger.Fields{"err": err})
+				logger.Error("Error removing non-ECS image", fields, logger.Fields{field.Error: err})
 			} else {
 				logger.Info("Non-ECS image removed", fields)
 				numImagesAlreadyDeleted++
@@ -524,14 +524,14 @@ func (imageManager *dockerImageManager) getNonECSImages(ctx context.Context) []I
 	for _, imageID := range r.ImageIDs {
 		resp, err := imageManager.client.InspectImage(imageID)
 		if err != nil {
-			logger.Error("Error inspecting non-ECS image", logger.Fields{"imageID": imageID, "err": err})
+			logger.Error("Error inspecting non-ECS image", logger.Fields{field.ImageID: imageID, field.Error: err})
 			continue
 		}
 		createTime := time.Time{}
 		createTime, err = time.Parse(time.RFC3339, resp.Created)
 		if err != nil {
 			logger.Warn("Error parsing the inspected non-ECS image created time.",
-				logger.Fields{"imageID": imageID, "err": err})
+				logger.Fields{field.ImageID: imageID, field.Error: err})
 		}
 		allImages = append(allImages,
 			ImageWithSizeID{
@@ -675,7 +675,7 @@ func (imageManager *dockerImageManager) deleteImage(ctx context.Context, imageID
 		if strings.Contains(strings.ToLower(err.Error()), imageNotFoundForDeletionError) {
 			logger.Error(fmt.Sprintf("Image already removed from the instance: %v", imageID), imageState.Fields())
 		} else {
-			logger.Error(fmt.Sprintf("Error removing Image %v", imageID), imageState.Fields(), logger.Fields{"err": err})
+			logger.Error(fmt.Sprintf("Error removing Image %v", imageID), imageState.Fields(), logger.Fields{field.Error: err})
 			delete(imageManager.imageStatesConsideredForDeletion, imageState.Image.ImageID)
 			return
 		}
diff --git a/agent/engine/image/types.go b/agent/engine/image/types.go
index 2cb1a4eca84..46be2dd1721 100644
--- a/agent/engine/image/types.go
+++ b/agent/engine/image/types.go
@@ -203,12 +203,12 @@ func (imageState *ImageState) Fields() logger.Fields {
 	}
 
 	return logger.Fields{
-		"imageID":            imageID,
-		"imageNames":         names,
-		"imageSizeBytes":     size,
-		"referencedBy":       len(imageState.Containers),
-		"imagePulledAt":      imageState.PulledAt.UTC().Format(time.RFC3339),
-		"imageLastUsedAt":    imageState.LastUsedAt.UTC().Format(time.RFC3339),
-		"imagePullSucceeded": imageState.PullSucceeded,
+		field.ImageID:            imageID,
+		field.ImageNames:         names,
+		field.ImageSizeBytes:     size,
+		"referencedBy":           len(imageState.Containers),
+		field.ImagePulledAt:      imageState.PulledAt.UTC().Format(time.RFC3339),
+		field.ImageLastUsedAt:    imageState.LastUsedAt.UTC().Format(time.RFC3339),
+		field.ImagePullSucceeded: imageState.PullSucceeded,
 	}
 }
diff --git a/ecs-agent/logger/field/constants.go b/ecs-agent/logger/field/constants.go
index fbfd713ffe9..8b154e1dbec 100644
--- a/ecs-agent/logger/field/constants.go
+++ b/ecs-agent/logger/field/constants.go
@@ -14,29 +14,38 @@
 package field
 
 const (
-	TaskID         = "task"
-	TaskARN        = "taskARN"
-	Container      = "container"
-	DockerId       = "dockerId"
-	ManagedAgent   = "managedAgent"
-	KnownStatus    = "knownStatus"
-	KnownSent      = "knownSent"
-	DesiredStatus  = "desiredStatus"
-	SentStatus     = "sentStatus"
-	FailedStatus   = "failedStatus"
-	Sequence       = "seqnum"
-	Reason         = "reason"
-	Status         = "status"
-	RuntimeID      = "runtimeID"
-	Elapsed        = "elapsed"
-	Resource       = "resource"
-	Error          = "error"
-	Event          = "event"
-	Image          = "image"
-	Volume         = "volume"
-	Time           = "time"
-	NetworkMode    = "networkMode"
-	Cluster        = "cluster"
-	ServiceName    = "ServiceName"
-	TaskProtection = "TaskProtection"
+	TaskID             = "task"
+	TaskARN            = "taskARN"
+	Container          = "container"
+	DockerId           = "dockerId"
+	ManagedAgent       = "managedAgent"
+	KnownStatus        = "knownStatus"
+	KnownSent          = "knownSent"
+	DesiredStatus      = "desiredStatus"
+	SentStatus         = "sentStatus"
+	FailedStatus       = "failedStatus"
+	Sequence           = "seqnum"
+	Reason             = "reason"
+	Status             = "status"
+	RuntimeID          = "runtimeID"
+	Elapsed            = "elapsed"
+	Resource           = "resource"
+	Error              = "error"
+	Event              = "event"
+	Image              = "image"
+	Volume             = "volume"
+	Time               = "time"
+	NetworkMode        = "networkMode"
+	Cluster            = "cluster"
+	ServiceName        = "ServiceName"
+	TaskProtection     = "TaskProtection"
+	ImageID            = "imageID"
+	ImageNames         = "imageNames"
+	ImageSizeBytes     = "imageSizeBytes"
+	ImagePulledAt      = "imagePulledAt"
+	ImageLastUsedAt    = "imageLastUsedAt"
+	ImagePullSucceeded = "imagePullSucceeded"
+	ContainerName      = "containerName"
+	ContainerImage     = "containerImage"
+	ContainerExitCode  = "containerExitCode"
 )