chore: remove refs to deprecated io/ioutil

pkg/systemstatsmonitor/net_collector_test.go

@@ -1,7 +1,6 @@
 package systemstatsmonitor
 
 import (
-	"io/ioutil"
 	"os"
 	"path"
 	"regexp"
@@ -48,12 +47,8 @@ func newFakeInt64Metric(metricID metrics.MetricID, viewName string, description
 // testCollectAux is a test auxiliary function used for testing netCollector.Collect
 func testCollectAux(t *testing.T, name string, excludeInterfaceRegexp ssmtypes.NetStatsInterfaceRegexp, validate func(*testing.T, *netCollector)) {
 	// mkdir /tmp/proc-X
-	procDir, err := ioutil.TempDir(os.TempDir(), "proc-")
-	if err != nil {
-		t.Fatalf("Failed to create temp proc directory: %v", err)
-	}
-	// rm -r /tmp/proc-X
-	defer os.RemoveAll(procDir)
+	procDir := t.TempDir()
+
 	// mkdir -C /tmp/proc-X/net
 	procNetDir := path.Join(procDir, "net")
 	if err := os.Mkdir(procNetDir, 0777); err != nil {

pkg/systemstatsmonitor/osfeature_collector.go

@@ -15,7 +15,7 @@ package systemstatsmonitor
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -102,7 +102,7 @@ func (ofc *osFeatureCollector) recordFeaturesFromCmdline(cmdlineArgs []system.Cm
 func (ofc *osFeatureCollector) recordFeaturesFromModules(modules []system.Module) {
 	// Collect known modules (default modules based on guest OS present in known-modules.json)
 	var knownModules []system.Module
-	f, err := ioutil.ReadFile(ofc.config.KnownModulesConfigPath)
+	f, err := os.ReadFile(ofc.config.KnownModulesConfigPath)
 	if err != nil {
 		glog.Warningf("Failed to read configuration file %s: %v",
 			ofc.config.KnownModulesConfigPath, err)

pkg/systemstatsmonitor/system_stats_monitor.go

@@ -18,7 +18,7 @@ package systemstatsmonitor
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"time"
 
@@ -58,7 +58,7 @@ func NewSystemStatsMonitorOrDie(configPath string) types.Monitor {
 	}
 
 	// Apply configurations.
-	f, err := ioutil.ReadFile(configPath)
+	f, err := os.ReadFile(configPath)
 	if err != nil {
 		glog.Fatalf("Failed to read configuration file %q: %v", configPath, err)
 	}