diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 274879a9..23493e49 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Release History
 
-## v0.3.0 (2021-12-21)
+## v0.3.0 (2021-12-22)
 
 - feat: implement transaction mechanism for load test
 - feat: support `--continue-on-failure` flag to continue running next step when failure occurs
diff --git a/internal/boomer/output.go b/internal/boomer/output.go
index 4074f431..ae2308fa 100644
--- a/internal/boomer/output.go
+++ b/internal/boomer/output.go
@@ -9,6 +9,7 @@ import (
 	"strconv"
 	"time"
 
+	"github.com/google/uuid"
 	"github.com/olekukonko/tablewriter"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/push"
@@ -366,8 +367,9 @@ var (
 
 // NewPrometheusPusherOutput returns a PrometheusPusherOutput.
 func NewPrometheusPusherOutput(gatewayURL, jobName string) *PrometheusPusherOutput {
+	nodeUUID, _ := uuid.NewUUID()
 	return &PrometheusPusherOutput{
-		pusher: push.New(gatewayURL, jobName),
+		pusher: push.New(gatewayURL, jobName).Grouping("instance", nodeUUID.String()),
 	}
 }