ClusterID            string         `json:"cluster_id,omitempty"`
	ProxyID              string         `json:"proxy,omitempty"`
	ProxyType            model.NodeType `json:"proxy_type,omitempty"`
	ProxyVersion         string         `json:"proxy_version,omitempty"`
	IstioVersion         string         `json:"istio_version,omitempty"`
	ClusterSent          string         `json:"cluster_sent,omitempty"`

	b.WriteString("BaseVersion:       " + fmt.Sprint(a.BaseVersion) + "\n")
	b.WriteString("BaseImageRegistry: " + fmt.Sprint(a.BaseImageRegistry) + "\n")
	b.WriteString("ProxyVersion:      " + fmt.Sprint(a.ProxyVersion) + "\n")
	b.WriteString("ZtunnelVersion:    " + fmt.Sprint(a.ZtunnelVersion) + "\n")
	b.WriteString("IstioVersion:      " + fmt.Sprint(a.IstioVersion) + "\n")

			sets.InsertOrNew(proxyVersionsMap, revision, pi.IstioVersion)
		}
	}
	for revision, vmap := range proxyVersionsMap {
		for v := range vmap {
			proxyVersions[revision] = append(proxyVersions[revision], v)
		}
	}
	return istioVersions, proxyVersions
}

func getIstioVersion(kubeClient kube.CLIClient, istioNamespace string) string {
	versions, err := kubeClient.GetIstioVersions(context.TODO(), istioNamespace)

				{
					ApplyTo: networking.EnvoyFilter_LISTENER,
					Match: &networking.EnvoyFilter_EnvoyConfigObjectMatch{
						Proxy: &networking.EnvoyFilter_ProxyMatch{
							ProxyVersion: "%#@~++==`24c234`",
						},
					},
					Patch: &networking.EnvoyFilter_Patch{
						Operation: networking.EnvoyFilter_Patch_REMOVE,
					},
				},
			},

			continue
		}

		// ensure that the supplied regex for proxy version compiles
		if cp.Match != nil && cp.Match.Proxy != nil && cp.Match.Proxy.ProxyVersion != "" {
			if _, err := regexp.Compile(cp.Match.Proxy.ProxyVersion); err != nil {
				errs = validation.AppendValidation(errs, fmt.Errorf("Envoy filter: invalid regex for proxy version, [%v]", err)) // nolint: stylecheck
				continue
			}
		}

	rootCmd.Flags().StringVar(&globalArgs.BaseImageRegistry, "image-base-registry", globalArgs.BaseImageRegistry, "base image registry to use")
	rootCmd.Flags().StringVar(&globalArgs.ProxyVersion, "proxy-version", globalArgs.ProxyVersion, "proxy version to use")
	rootCmd.Flags().StringVar(&globalArgs.ZtunnelVersion, "ztunnel-version", globalArgs.ZtunnelVersion, "ztunnel version to use")

    template: "This EnvoyFilter does not have a priority and has a relative patch operation (NSTERT_BEFORE/AFTER, REPLACE, MERGE, DELETE) and proxyVersion set which can cause the EnvoyFilter not to be applied during an upgrade....

			pversion := &model.IstioVersion{
				Major: tt.fields.Major,
				Minor: tt.fields.Minor,
				Patch: tt.fields.Patch,
			}
			if got := pversion.Compare(tt.args.inv); got != tt.want {
				t.Errorf("ProxyVersion.Compare() = %v, want %v", got, tt.want)
			}
		})
	}
}

func Test_parseIstioVersion(t *testing.T) {
	type args struct {
		ver string
	}
	tests := []struct {
		name string
		args args

	clusterID          string                // Cluster in which proxy is running.
	proxyID            string                // Identifier that uniquely identifies a proxy.
	proxyVersion       string                // Version of Proxy.
	proxyType          model.NodeType        // Indicates whether the proxy is sidecar or gateway.
	sidecarScope       *model.SidecarScope   // Computed sidecar for the proxy.

	// Description: This EnvoyFilter does not have a priority and has a relative patch operation (NSTERT_BEFORE/AFTER, REPLACE, MERGE, DELETE) and proxyVersion set which can cause the EnvoyFilter not to be applied during an upgrade. Using the INSERT_FIRST or ADD option or setting the priority may help in ensuring the EnvoyFilter is applied correctly.