refactor: case-insensitive normalization for resources-to-ignore

Use strings.ToLower so any casing (configMaps, ConfigMaps, sEcrets)
normalizes to the canonical lowercase ResourceMap key, and simplify the
flag help text. Addresses PR review feedback.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: yvjessestephens

internal/pkg/util/util.go

@@ -93,7 +93,7 @@ func ConfigureReloaderFlags(cmd *cobra.Command) {
 	cmd.PersistentFlags().StringVar(&options.LogFormat, "log-format", "", "Log format to use (empty string for text, or JSON)")
 	cmd.PersistentFlags().StringVar(&options.LogLevel, "log-level", "info", "Log level to use (trace, debug, info, warning, error, fatal and panic)")
 	cmd.PersistentFlags().StringVar(&options.WebhookUrl, "webhook-url", "", "webhook to trigger instead of performing a reload")
-	cmd.PersistentFlags().StringSliceVar(&options.ResourcesToIgnore, "resources-to-ignore", options.ResourcesToIgnore, "list of resources to ignore (valid options 'configmaps' or 'secrets'; 'configMaps' is also accepted for backward compatibility)")
+	cmd.PersistentFlags().StringSliceVar(&options.ResourcesToIgnore, "resources-to-ignore", options.ResourcesToIgnore, "list of resources to ignore (valid options 'configmaps' or 'secrets')")
 	cmd.PersistentFlags().StringSliceVar(&options.WorkloadTypesToIgnore, "ignored-workload-types", options.WorkloadTypesToIgnore, "list of workload types to ignore (valid options: 'jobs', 'cronjobs', or both)")
 	cmd.PersistentFlags().StringSliceVar(&options.NamespacesToIgnore, "namespaces-to-ignore", options.NamespacesToIgnore, "list of namespaces to ignore")
 	cmd.PersistentFlags().StringSliceVar(&options.NamespaceSelectors, "namespace-selector", options.NamespaceSelectors, "list of key:value labels to filter on for namespaces")
@@ -113,13 +113,13 @@ func GetIgnoredResourcesList() (List, error) {
 
 	ignoredResourcesList := options.ResourcesToIgnore // getStringSliceFromFlags(cmd, "resources-to-ignore")
 
-	// Normalize to the canonical lowercase keys used in kube.ResourceMap.
-	// Accept the legacy "configMaps" spelling for backward compatibility with
-	// charts that still emit the camelCase form.
+	// Normalize to the canonical lowercase keys used in kube.ResourceMap so the
+	// comparison is case-insensitive (e.g. "configMaps", "ConfigMaps", "sEcrets"
+	// all map to their canonical lowercase form).
 	normalized := make(List, 0, len(ignoredResourcesList))
 	for _, v := range ignoredResourcesList {
-		switch v {
-		case "configMaps", "configmaps":
+		switch strings.ToLower(v) {
+		case "configmaps":
 			normalized = append(normalized, "configmaps")
 		case "secrets":
 			normalized = append(normalized, "secrets")

internal/pkg/util/util_test.go

@@ -161,12 +161,24 @@ func TestGetIgnoredResourcesList(t *testing.T) {
 			expectError: false,
 			expected:    []string{"configmaps"},
 		},
+		{
+			name:        "Mixed-case ConfigMaps normalizes to configmaps",
+			resources:   []string{"ConfigMaps"},
+			expectError: false,
+			expected:    []string{"configmaps"},
+		},
 		{
 			name:        "secrets",
 			resources:   []string{"secrets"},
 			expectError: false,
 			expected:    []string{"secrets"},
 		},
+		{
+			name:        "Mixed-case sEcrets normalizes to secrets",
+			resources:   []string{"sEcrets"},
+			expectError: false,
+			expected:    []string{"secrets"},
+		},
 		{
 			name:        "Empty list",
 			resources:   []string{},