chore: improve string normalization for metric names (#3862)

Fixes #3789

CHANGELOG.md

@@ -54,6 +54,7 @@ To learn more about active deprecations, we recommend checking [GitHub Discussio
 - **General:** Add explicit seccompProfile type to securityContext config ([#3561](https://github.com/kedacore/keda/issues/3561))
 - **General:** Add `Min` column to ScaledJob visualization ([#3689](https://github.com/kedacore/keda/issues/3689))
 - **General:** Add support to use pod identities for authentication in Azure Key Vault ([#3813](https://github.com/kedacore/keda/issues/3813)
+- **General:** Improve the function used to normalize metric names ([#3789](https://github.com/kedacore/keda/issues/3789)
 - **Apache Kafka Scaler:** SASL/OAuthbearer Implementation ([#3681](https://github.com/kedacore/keda/issues/3681))
 - **Azure AD Pod Identity Authentication:** Improve error messages to emphasize problems around the integration with aad-pod-identity itself ([#3610](https://github.com/kedacore/keda/issues/3610))
 - **Azure Event Hub Scaler:** Support Azure Active Direcotry Pod & Workload Identity for Storage Blobs ([#3569](https://github.com/kedacore/keda/issues/3569))

pkg/util/normalize_string.go

@@ -36,6 +36,8 @@ func NormalizeString(s string) string {
 	s = strings.ReplaceAll(s, ".", "-")
 	s = strings.ReplaceAll(s, ":", "-")
 	s = strings.ReplaceAll(s, "%", "-")
+	s = strings.ReplaceAll(s, "(", "-")
+	s = strings.ReplaceAll(s, ")", "-")
 	return s
 }