enable linter on repository

pkg/logcounter/types/types.go

@@ -14,8 +14,10 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+// Package types contains the types for log counter.
 package types
 
+// LogCounter is the interface for a log counter.
 type LogCounter interface {
 	Count() (int, error)
 }

pkg/systemstatsmonitor/cpu_collector_unix.go

@@ -62,6 +62,10 @@ func (cc *cpuCollector) recordSystemStats() {
 	}
 
 	fs, err := procfs.NewFS(cc.procPath)
+	if err != nil {
+		klog.Errorf("Failed to open procfs: %v", err)
+		return
+	}
 	stats, err := fs.Stat()
 	if err != nil {
 		klog.Errorf("Failed to retrieve cpu/process stats: %v", err)

pkg/systemstatsmonitor/net_collector.go

@@ -219,6 +219,10 @@ func (nc *netCollector) mustRegisterMetric(metricID metrics.MetricID, descriptio
 
 func (nc *netCollector) recordNetDev() {
 	fs, err := procfs.NewFS(nc.procPath)
+	if err != nil {
+		klog.Errorf("Failed to open procfs: %v", err)
+		return
+	}
 	stats, err := fs.NetDev()
 	if err != nil {
 		klog.Errorf("Failed to retrieve net dev stat: %v", err)