chore: enhance metric labels implementation

Original work by @Suraiya-Hameed in kubernetes-sigs#1433

Changes:
- Minor refinements suggested by project maintainers

Co-authored-by: Suraiya Hameed <Suraiya-Hameed@users.noreply.github.com>

controllers/stats_reporter.go

@@ -65,16 +65,12 @@ func newStatsReporter() (StatsReporter, error) {
 func (r reporter) ReportSyncSecretCtMetric(ctx context.Context, provider, namespace, spc string) {
 	opt := metric.WithAttributes(
 		attribute.Key(providerKey).String(provider),
-		attribute.Key(osTypeKey).String(runtimeOS),
 		attribute.Key(namespaceKey).String(namespace),
 		attribute.Key(spcKey).String(spc),
 	)
 	r.syncK8sSecretTotal.Add(ctx, 1, opt)
 }
 
 func (r reporter) ReportSyncSecretDuration(ctx context.Context, duration float64) {
-	opt := metric.WithAttributes(
-		attribute.Key(osTypeKey).String(runtimeOS),
-	)
-	r.syncK8sSecretDuration.Record(ctx, duration, opt)
+	r.syncK8sSecretDuration.Record(ctx, duration)
 }

pkg/rotation/reconciler.go

@@ -253,14 +253,14 @@ func (r *Reconciler) reconcile(ctx context.Context, spcps *secretsstorev1.Secret
 	var providerName string
 	podName := spcps.Status.PodName
 	podNamespace := spcps.Namespace
-	secretProviderClass := spcps.Status.SecretProviderClassName
+	secretProviderClassName := spcps.Status.SecretProviderClassName
 
 	defer func() {
 		if err != nil {
-			r.reporter.reportRotationErrorCtMetric(ctx, providerName, podName, podNamespace, secretProviderClass, errorReason, requiresUpdate)
+			r.reporter.reportRotationErrorCtMetric(ctx, providerName, podName, podNamespace, secretProviderClassName, errorReason, requiresUpdate)
 			return
 		}
-		r.reporter.reportRotationCtMetric(ctx, providerName, podName, podNamespace, secretProviderClass, requiresUpdate)
+		r.reporter.reportRotationCtMetric(ctx, providerName, podName, podNamespace, secretProviderClassName, requiresUpdate)
 		r.reporter.reportRotationDuration(ctx, time.Since(begin).Seconds())
 	}()
 
@@ -293,13 +293,13 @@ func (r *Reconciler) reconcile(ctx context.Context, spcps *secretsstorev1.Secret
 		ctx,
 		client.ObjectKey{
 			Namespace: podNamespace,
-			Name:      secretProviderClass,
+			Name:      secretProviderClassName,
 		},
 		spc,
 	)
 	if err != nil {
 		errorReason = internalerrors.SecretProviderClassNotFound
-		return fmt.Errorf("failed to get secret provider class %s/%s, err: %w", podNamespace, secretProviderClass, err)
+		return fmt.Errorf("failed to get secret provider class %s/%s, err: %w", podNamespace, secretProviderClassName, err)
 	}
 
 	// determine which pod volume this is associated with