Merge pull request #1898 from k8s-infra-cherrypick-robot/cherry-pick-1895-to-release-1.15

[release-1.15] [metrics] Fix panic during metrics manager startup

Author: k8s-ci-robot

pkg/metrics/metrics.go

@@ -39,11 +39,6 @@ const (
 )
 
 var (
-	gkeComponentVersion        *metrics.GaugeVec
-	pdcsiOperationErrorsMetric *metrics.CounterVec
-)
-
-func initMetrics() {
 	// This metric is exposed only from the controller driver component when GKE_PDCSI_VERSION env variable is set.
 	gkeComponentVersion = metrics.NewGaugeVec(&metrics.GaugeOpts{
 		Name: "component_version",
@@ -58,7 +53,7 @@ func initMetrics() {
 			StabilityLevel: metrics.ALPHA,
 		},
 		[]string{"driver_name", "method_name", "grpc_status_code", "disk_type", "enable_confidential_storage", "enable_storage_pools"})
-}
+)
 
 type MetricsManager struct {
 	registry metrics.KubeRegistry

pkg/metrics/metrics_test_util.go

@@ -19,5 +19,6 @@ package metrics
 // Test-only method used for resetting metric counts.
 func (mm *MetricsManager) ResetMetrics() {
 	// Re-initialize metrics
-	initMetrics()
+	gkeComponentVersion.Reset()
+	pdcsiOperationErrorsMetric.Reset()
 }