diff --git a/main.go b/main.go
index ba1eed5..6b35467 100644
--- a/main.go
+++ b/main.go
@@ -54,7 +54,7 @@ func main() {
 
 	var labels []string
 	for _, label := range prometheusContainerLabels {
-		labels = append(labels, strings.Replace(label, ".", "_", -1))
+		labels = append(labels, strings.ReplaceAll(label, ".", "_"))
 	}
 	kubernetesCounterVec = prometheus.NewCounterVec(prometheus.CounterOpts{
 		Name: "klog_pod_oomkill",
@@ -65,8 +65,8 @@ func main() {
 
 	go func() {
 		glog.Info("Starting prometheus metrics")
-		http.Handle("/metrics", promhttp.Handler())
-		glog.Warning(http.ListenAndServe(metricsAddr, nil))
+		http.Handle("/metrics", promhttp.Handler()) //permit
+		glog.Warning(http.ListenAndServe(metricsAddr, nil)) //permit
 	}()
 
 	kmsgWatcher := kmsg.NewKmsgWatcher(types.WatcherConfig{Plugin: "kmsg"})
@@ -89,12 +89,16 @@ func main() {
 	}
 }
 
-func getContainerIDFromLog(log string) (string, string) {
+func getContainerIDFromLog(log string) (podUID, containerID string) {
+	podUID = ""
+	containerID = ""
+
 	if matches := kmesgRE.FindStringSubmatch(log); matches != nil {
-		return matches[1], matches[2]
+		podUID = matches[1]
+		containerID = matches[2]
 	}
 
-	return "", ""
+	return
 }
 
 func getContainerLabels(containerID string, cli *containerd.Client) (map[string]string, error) {
@@ -111,8 +115,7 @@ func prometheusCount(containerLabels map[string]string) {
 	var counter prometheus.Counter
 	var err error
 
-	var labels map[string]string
-	labels = make(map[string]string)
+	labels := make(map[string]string)
 	for key, label := range prometheusContainerLabels {
 		labels[label] = containerLabels[key]
 	}
diff --git a/main_test.go b/main_test.go
index e0bdbe3..ddee882 100644
--- a/main_test.go
+++ b/main_test.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"strings"
 	"testing"
@@ -33,14 +34,14 @@ func parseMessage(input string) (kmsgparser.Message, error) {
 	//   PRIORITY,SEQUENCE_NUM,TIMESTAMP,-;MESSAGE
 	parts := strings.SplitN(input, ";", 2)
 	if len(parts) != 2 {
-		return kmsgparser.Message{}, fmt.Errorf("invalid kmsg; must contain a ';'")
+		return kmsgparser.Message{}, errors.New("invalid kmsg; must contain a ';'")
 	}
 
 	metadata, message := parts[0], parts[1]
 
 	metadataParts := strings.Split(metadata, ",")
 	if len(metadataParts) < 3 {
-		return kmsgparser.Message{}, fmt.Errorf("invalid kmsg: must contain at least 3 ',' separated pieces at the start")
+		return kmsgparser.Message{}, errors.New("invalid kmsg: must contain at least 3 ',' separated pieces at the start")
 	}
 
 	return kmsgparser.Message{
@@ -48,17 +49,18 @@ func parseMessage(input string) (kmsgparser.Message, error) {
 	}, nil
 }
 
-func getTestData() ([]string, []string, []string) {
-	return []string{
-			"6,22743,6115623303887,-;oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=9f02d9fa0049eb2655fc83c765f142362b2cb403b57b70ba3185071015ca3b64,mems_allowed=0-1,oom_memcg=/kubepods/burstable/podd11ab7b0-d6db-4a24-a7de-4a2faf1e6980/9f02d9fa0049eb2655fc83c765f142362b2cb403b57b70ba3185071015ca3b64,task_memcg=/kubepods/burstable/podd11ab7b0-d6db-4a24-a7de-4a2faf1e6980/9f02d9fa0049eb2655fc83c765f142362b2cb403b57b70ba3185071015ca3b64,task=prometheus-conf,pid=3401999,uid=0",
-			"6,23800,6780904484233,-;oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=cri-containerd-2260b35b008a15bd118e629c0c5d74e7f3a1fe18c724fbac61a54862fea196dc.scope,mems_allowed=0,oom_memcg=/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-poddfc377c9_c533_4d51_af9e_6e0e0b3db83b.slice,task_memcg=/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-poddfc377c9_c533_4d51_af9e_6e0e0b3db83b.slice/cri-containerd-2260b35b008a15bd118e629c0c5d74e7f3a1fe18c724fbac61a54862fea196dc.scope,task=stress,pid=255629,uid=0",
-		},
-		[]string{
-			"d11ab7b0-d6db-4a24-a7de-4a2faf1e6980",
-			"dfc377c9_c533_4d51_af9e_6e0e0b3db83b",
-		},
-		[]string{
-			"9f02d9fa0049eb2655fc83c765f142362b2cb403b57b70ba3185071015ca3b64",
-			"2260b35b008a15bd118e629c0c5d74e7f3a1fe18c724fbac61a54862fea196dc",
-		}
+func getTestData() (klog, podUIDs, containerIDs []string) {
+	klog = []string{
+		"6,22743,6115623303887,-;oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=9f02d9fa0049eb2655fc83c765f142362b2cb403b57b70ba3185071015ca3b64,mems_allowed=0-1,oom_memcg=/kubepods/burstable/podd11ab7b0-d6db-4a24-a7de-4a2faf1e6980/9f02d9fa0049eb2655fc83c765f142362b2cb403b57b70ba3185071015ca3b64,task_memcg=/kubepods/burstable/podd11ab7b0-d6db-4a24-a7de-4a2faf1e6980/9f02d9fa0049eb2655fc83c765f142362b2cb403b57b70ba3185071015ca3b64,task=prometheus-conf,pid=3401999,uid=0",
+		"6,23800,6780904484233,-;oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=cri-containerd-2260b35b008a15bd118e629c0c5d74e7f3a1fe18c724fbac61a54862fea196dc.scope,mems_allowed=0,oom_memcg=/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-poddfc377c9_c533_4d51_af9e_6e0e0b3db83b.slice,task_memcg=/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-poddfc377c9_c533_4d51_af9e_6e0e0b3db83b.slice/cri-containerd-2260b35b008a15bd118e629c0c5d74e7f3a1fe18c724fbac61a54862fea196dc.scope,task=stress,pid=255629,uid=0",
+	}
+	podUIDs = []string{
+		"d11ab7b0-d6db-4a24-a7de-4a2faf1e6980",
+		"dfc377c9_c533_4d51_af9e_6e0e0b3db83b",
+	}
+	containerIDs = []string{
+		"9f02d9fa0049eb2655fc83c765f142362b2cb403b57b70ba3185071015ca3b64",
+		"2260b35b008a15bd118e629c0c5d74e7f3a1fe18c724fbac61a54862fea196dc",
+	}
+	return
 }