enabled a few more linter rules

pkg/util/helpers_linux_test.go

@@ -21,6 +21,7 @@ import (
 )
 
 func TestGetOSVersionLinux(t *testing.T) {
+	t.Parallel()
 	testCases := []struct {
 		name              string
 		fakeOSReleasePath string

pkg/util/metrics/helpers_test.go

@@ -56,7 +56,7 @@ func TestPrometheusMetricsParsingAndMatching(t *testing.T) {
 				// Metric with non-existent label.
 				{
 					Name:   "host_uptime",
-					Labels: map[string]string{"non-existant-version": "0.0.1"},
+					Labels: map[string]string{"non-existent-version": "0.0.1"},
 				},
 				// Metric with incorrect label.
 				{

pkg/util/metrics/system/cmdline_args.go

@@ -17,6 +17,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"strings"
+
+	"k8s.io/klog/v2"
 )
 
 type CmdlineArg struct {
@@ -25,7 +27,11 @@ type CmdlineArg struct {
 }
 
 func (d CmdlineArg) String() string {
-	s, _ := json.Marshal(d)
+	s, err := json.Marshal(d)
+	if err != nil {
+		klog.Errorf("failed to marshal cmdline arg: %v", err)
+		return ""
+	}
 	return string(s)
 }
 

pkg/util/metrics/system/module_stats.go

@@ -18,6 +18,8 @@ import (
 	"fmt"
 	"strconv"
 	"strings"
+
+	"k8s.io/klog/v2"
 )
 
 type Module struct {
@@ -29,7 +31,11 @@ type Module struct {
 }
 
 func (d Module) String() string {
-	s, _ := json.Marshal(d)
+	s, err := json.Marshal(d)
+	if err != nil {
+		klog.Errorf("failed to marshal module stat: %v", err)
+		return ""
+	}
 	return string(s)
 }