var lookup = {},
    result = [];

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

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

return JSON.stringify(result);