filterConfigProto = a.setAuthnFilterForRequestAuthn(filterConfigProto)

	if filterConfigProto == nil {
		return nil
	}
	// disable clear route cache for sidecars because the JWT claim based routing is only supported on gateways.
	filterConfigProto.DisableClearRouteCache = forSidecar

	ServiceAccount string `json:"SERVICE_ACCOUNT,omitempty"`

	// HTTPProxyPort enables http proxy on the port for the current sidecar.
	// Same as MeshConfig.HttpProxyPort, but with per/sidecar scope.
	HTTPProxyPort string `json:"HTTP_PROXY_PORT,omitempty"`

	// MeshID specifies the mesh ID environment variable.
	MeshID string `json:"MESH_ID,omitempty"`

		ValidateProto: validation.ValidateServiceEntry,
	}.MustBuild()

	Sidecar = resource.Builder{
		Identifier: "Sidecar",
		Group:      "networking.istio.io",
		Kind:       "Sidecar",
		Plural:     "sidecars",
		Version:    "v1alpha3",
		VersionAliases: []string{
			"v1beta1",
			"v1",
		},
		Proto: "istio.networking.v1alpha3.Sidecar", StatusProto: "istio.meta.v1alpha1.IstioStatus",

Next, for an individual proxy we will check if it could possibly be impacted by the change. For example, we know a sidecar never is impacted by a `Gateway` update, and we can also look at scoping (from `Sidecar.egress.hosts`) to further restrict update scopes.

resources utilization under steady load.\n\n- **vCPU / 1k rps:** shows vCPU utilization by the main Istio components normalized by 1000 requests/second. When idle or low traffic, this chart will be blank. The curve for istio-proxy refers to the services sidecars only.\n- **vCPU:** vCPU utilization by Istio components, not normalized.\n- **Memory:** memory footprint for the components. Telemetry and policy are normalized by 1k rps, and no data is shown  when there is no traffic. For ingress and istio-proxy,...

			}
		}()

		return true
	})

	// Wait for all go routine to complete.
	wg.Wait()

	if hasChange.Load() {
		atomic.AddUint64(&r.refreshJobKeyChangedCount, 1)
		// Push public key changes to sidecars.
		if r.PushFunc != nil {
			r.PushFunc()
		}
	}
	return hasErrors.Load()
}

// Close will shut down the refresher job.
// TODO: may need to figure out the right place to call this function.

	if len(duplicates) == 0 {
		for _, h := range hosts {
			knownHosts[h] = bind
		}
	}
	return duplicates
}

// gatewayRDSRouteName generates the RDS route config name for gateway's servers.
// Unlike sidecars where the RDS route name is the listener port number, gateways have a different
// structure for RDS.
// HTTP servers have route name set to http.<portNumber>.
//

	}

	if !isGateway {
		// namespace can be * or . or ~ or a valid DNS label in sidecars
		if parts[0] != "*" && parts[0] != "." && parts[0] != "~" {
			if !labels.IsDNS1123Label(parts[0]) {
				errs = AppendErrors(errs, fmt.Errorf("invalid namespace value %q in sidecar", parts[0]))
			}
		}
	} else {
		// namespace can be * or . or a valid DNS label in gateways

// foo.ns2.svc.cluster.local). In this case, if the proxy is in ns2.svc.cluster.local, then while
// generating alt virtual hosts for service foo.ns1 for the sidecars in ns2 namespace, we should generate
// foo.ns1, foo.ns1.svc, foo.ns1.svc.cluster.local and should not generate a virtual host called "foo" for
// foo.ns1 service.

	objEnabled := klabels.Set{"sidecar.istio.io/inject": "true"}
	objDisable := klabels.Set{"sidecar.istio.io/inject": "false"}
	objEnabledAndRev := klabels.Set{"sidecar.istio.io/inject": "true", "istio.io/rev": "canary"}
	objDisableAndRev := klabels.Set{"sidecar.istio.io/inject": "false", "istio.io/rev": "canary"}

	defaultWebhook := getWebhooks(t, "", "istio-sidecar-injector")