use secret version as checksum

controllers/instance/config.go

@@ -2,9 +2,6 @@ package instance
 
 import (
 	"context"
-	// #nosec
-	"crypto/md5"
-	"encoding/hex"
 	"fmt"
 	"path/filepath"
 	"sort"
@@ -111,20 +108,7 @@ func (r *Reconciler) reconcileConfig(ctx context.Context, instance *proxyv1alpha
 		logger.Info(fmt.Sprintf("Object %s", result), "secret", configSecret.Name)
 	}
 
-	cs := generateChecksum(configSecret)
-
-	return cs, nil
-}
-
-// #nosec
-func generateChecksum(secret *corev1.Secret) string {
-	var b []byte
-	for k := range secret.Data {
-		b = append(b, secret.Data[k]...)
-	}
-
-	hash := md5.Sum(b)
-	return hex.EncodeToString(hash[:])
+	return configSecret.ResourceVersion, nil
 }
 
 func (r *Reconciler) generateHAPProxyConfiguration(ctx context.Context, instance *proxyv1alpha1.Instance, listens *configv1alpha1.ListenList, frontends *configv1alpha1.FrontendList, backends *configv1alpha1.BackendList, resolvers *configv1alpha1.ResolverList) (string, error) {