VPA Unnecessary error fix and add updateMode value validation

pkg/linters/templates/README.md

@@ -187,12 +187,12 @@ spec:
 
 **Error:**
 ```
-Error: VPA updateMode cannot be 'Auto'
+Error: VPA updateMode cannot be 'Auto' as it is deprecated. Please use 'InPlaceOrRecreate' instead
 ```
 
 **Why updateMode: Auto is no longer supported:**
 
-The `updateMode: Auto` is no longer supported (considered deprecated) because in the upstream `Vertical Pod Autoscaler`, this mode has been deprecated since `VPA 1.4.0` and is now an alias for `Recreate` - that is, it always works through eviction/recreation of Pods and does not provide the advantages of in-place resizing. 
+The `updateMode: Auto` is no longer supported (considered deprecated) because in the upstream `Vertical Pod Autoscaler`, this mode has been deprecated since `VPA 1.5.1` and is now an alias for `Recreate` - that is, it always works through eviction/recreation of Pods and does not provide the advantages of in-place resizing. 
 In `Deckhouse`, this has been fixed with a change: all `Deckhouse-managed VPAs` have been switched from `Auto` to `InPlaceOrRecreate` so that, if Kubernetes support is available, in-place resource updates are performed, and if it is not available, a fallback to eviction is performed. 
 
 **Which mode to use instead of Auto**

pkg/linters/templates/rules/types.go

@@ -115,11 +115,16 @@ const (
 	// creation and additionally can update them during the lifetime of the
 	// pod by deleting and recreating the pod.
 	UpdateModeRecreate UpdateMode = "Recreate"
+	// DEPRECATED since vpa version 1.5.1. It is now recommended to use InPlaceOrRecreate instead.
 	// UpdateModeAuto means that autoscaler assigns resources on pod creation
 	// and additionally can update them during the lifetime of the pod,
 	// using any available update method. Currently this is equivalent to
 	// Recreate, which is the only available update method.
 	UpdateModeAuto UpdateMode = "Auto"
+	// UpdateModeInPlaceOrReacreate means that autoscaler assigns resources on pod creation
+	// if Kubernetes support is available, in-place resource updates are performed,
+	// and if it is not available, a fallback to eviction is performed.
+	UpdateModeInPlaceOrReacreate UpdateMode = "InPlaceOrRecreate"
 )
 
 // PodResourcePolicy controls how autoscaler computes the recommended resources

pkg/linters/templates/rules/vpa.go

@@ -129,6 +129,16 @@ func fillVPAMaps(
 	vpaUpdateModes[target] = updateMode
 }
 
+// isValidUpdateMode checks if the updateMode is one of the allowed values
+func isValidUpdateMode(updateMode UpdateMode) bool {
+	switch updateMode {
+	case UpdateModeOff, UpdateModeInitial, UpdateModeRecreate, UpdateModeInPlaceOrReacreate, UpdateModeAuto:
+		return true
+	default:
+		return false
+	}
+}
+
 // parseVPAResourcePolicyContainers parses VPA containers names in ResourcePolicy and check if minAllowed and maxAllowed for container is set
 func parseVPAResourcePolicyContainers(vpaObject storage.StoreObject, errorList *errors.LintRuleErrorsList) (UpdateMode, set.Set, bool) {
 	errorListObj := errorList.WithObjectID(vpaObject.Identity()).WithFilePath(vpaObject.ShortPath())
@@ -145,10 +155,6 @@ func parseVPAResourcePolicyContainers(vpaObject storage.StoreObject, errorList *
 	}
 
 	updateMode := *v.Spec.UpdatePolicy.UpdateMode
-	if updateMode == UpdateModeAuto {
-		errorListObj.Errorf("VPA updateMode cannot be 'Auto'")
-		return updateMode, containers, false
-	}
 	if updateMode == UpdateModeOff {
 		return updateMode, containers, true
 	}
@@ -159,6 +165,14 @@ func parseVPAResourcePolicyContainers(vpaObject storage.StoreObject, errorList *
 		return updateMode, containers, false
 	}
 
+	if updateMode == UpdateModeAuto {
+		errorListObj.Errorf("VPA updateMode cannot be 'Auto' as it is deprecated. Please use 'InPlaceOrRecreate' instead")
+	}
+
+	if !isValidUpdateMode(updateMode) {
+		errorListObj.Errorf("Invalid updateMode '%s'. Allowed values are: Off, Initial, Recreate, InPlaceOrRecreate", updateMode)
+	}
+
 	for _, cp := range v.Spec.ResourcePolicy.ContainerPolicies {
 		if cp.MinAllowed.Cpu().IsZero() {
 			errorListObj.Errorf("No VPA specs minAllowed.cpu is found for container %s", cp.ContainerName)