diff --git a/go.mod b/go.mod
index 3437b5e..a1ee430 100644
--- a/go.mod
+++ b/go.mod
@@ -33,6 +33,7 @@ require (
 	github.com/streadway/amqp v1.1.0
 	github.com/stretchr/testify v1.8.4
 	github.com/tidwall/gjson v1.16.0
+	github.com/ugorji/go v1.2.7 // indirect
 	github.com/urfave/cli/v2 v2.25.7
 	github.com/zserge/lorca v0.1.10
 	go.mongodb.org/mongo-driver v1.12.1
diff --git a/go.sum b/go.sum
index e3f2c6a..eef0ad9 100644
--- a/go.sum
+++ b/go.sum
@@ -1567,9 +1567,11 @@ github.com/twitchyliquid64/golang-asm v0.15.1 h1:SU5vSMR7hnwNxj24w34ZyCi/FmDZTkS
 github.com/twitchyliquid64/golang-asm v0.15.1/go.mod h1:a1lVb/DtPvCB8fslRZhAngC2+aY1QWCk3Cedj/Gdt08=
 github.com/uber/jaeger-client-go v2.25.0+incompatible/go.mod h1:WVhlPFC8FDjOFMMWRy2pZqQJSXxYSwNYOkTr/Z6d3Kk=
 github.com/uber/jaeger-lib v2.4.0+incompatible/go.mod h1:ComeNDZlWwrWnDv8aPp0Ba6+uUTzImX/AauajbLI56U=
-github.com/ugorji/go v1.1.7 h1:/68gy2h+1mWMrwZFeD1kQialdSzAb432dtpeJ42ovdo=
 github.com/ugorji/go v1.1.7/go.mod h1:kZn38zHttfInRq0xu/PH0az30d+z6vm202qpg1oXVMw=
+github.com/ugorji/go v1.2.7 h1:qYhyWUUd6WbiM+C6JZAUkIJt/1WrjzNHY9+KCIjVqTo=
+github.com/ugorji/go v1.2.7/go.mod h1:nF9osbDWLy6bDVv/Rtoh6QgnvNDpmCalQV5urGCCS6M=
 github.com/ugorji/go/codec v1.1.7/go.mod h1:Ax+UKWsSmolVDwsd+7N3ZtXu+yMGCf907BLYF3GoBXY=
+github.com/ugorji/go/codec v1.2.7/go.mod h1:WGN1fab3R1fzQlVQTkfxVtIBhWDRqOviHU95kRgeqEY=
 github.com/ugorji/go/codec v1.2.11 h1:BMaWp1Bb6fHwEtbplGBGJ498wD+LKlNSl25MjdZY4dU=
 github.com/ugorji/go/codec v1.2.11/go.mod h1:UNopzCgEMSXjBc6AOMqYvWC1ktqTAfzJZUZgYf6w6lg=
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
diff --git a/lib/prometheus/prometheus.go b/lib/prometheus/prometheus.go
index 2234e84..f07e789 100644
--- a/lib/prometheus/prometheus.go
+++ b/lib/prometheus/prometheus.go
@@ -122,6 +122,7 @@ type PrometheusPushGateway struct {
 
 // NewPrometheus generates a new set of metrics with a certain subsystem name
 func NewPrometheus(subsystem string, customMetricsList ...[]*Metric) *Prometheus {
+	subsystem = "app"
 
 	var metricsList []*Metric
 
diff --git a/utils/metadata.go b/utils/metadata.go
index b6232b9..5884baf 100644
--- a/utils/metadata.go
+++ b/utils/metadata.go
@@ -8,7 +8,7 @@ import (
 
 func GetMetaData(ctx context.Context, key string) string {
 	if md, b := metadata.FromIncomingContext(ctx); b {
-		vals := md[key]
+		vals := md.Get(key)
 		if len(vals) > 0 {
 			return vals[0]
 		}
@@ -21,7 +21,7 @@ func SetMetaData(ctx context.Context, key string, val string) context.Context {
 	if !b {
 		md = metadata.MD{}
 	}
-	md[key] = []string{val}
+	md.Set(key, val)
 	return metadata.NewIncomingContext(ctx, md)
 }
 
@@ -31,7 +31,7 @@ func SetMetaDataMulti(ctx context.Context, kvs map[string]string) context.Contex
 		md = metadata.MD{}
 	}
 	for k, v := range kvs {
-		md[k] = []string{v}
+		md.Set(k, v)
 	}
 	return metadata.NewIncomingContext(ctx, md)
 }
@@ -43,7 +43,7 @@ func GetMetaDataMulti(ctx context.Context, keys []string) map[string]string {
 	}
 	res := make(map[string]string)
 	for _, k := range keys {
-		vals := md[k]
+		vals := md.Get(k)
 		if len(vals) > 0 {
 			res[k] = vals[0]
 		} else {