var lookup = {},
	result = [];

JSON.parse(value).forEach(function (item) {
		var envoy_listener_address = item.labels.envoy_listener_address;

		if (lookup[envoy_listener_address]) {
			return;
		}
		lookup[envoy_listener_address] = 1;
		result.push({
			'{#LISTENER_ADDRESS}': envoy_listener_address
		});
});

return JSON.stringify(result);