"typed_config": {
           "@type": "type.googleapis.com/envoy.extensions.filters.network.tcp_proxy.v3.TcpProxy",
           "stat_prefix": "PassthroughCluster",
           "cluster": "PassthroughCluster"
          }
         }
        ],
        "name": "PassthroughFilterChain"
       },
       "bind_to_port": false
      },
      "last_updated": "2023-06-20T09:07:41.955Z"

	a, ok := action.(*route.Route_Route)
	if !ok {
		return false
	}
	cl, ok := a.Route.ClusterSpecifier.(*route.RouteAction_Cluster)
	if !ok {
		return false
	}
	return cl.Cluster == pilot_util.PassthroughCluster