private static String formatRolloutOptions(final RolloutOptions options) {
if (options == null) {
return "";
}
final List<String> output = new ArrayList<>();
output.add(String.format("timeout: %d", options.getTimeout()));
output.add(String.format("parallelism: %d", options.getParallelism()));
output.add(String.format("migrate: %s", options.getMigrate()));
output.add(String.format("overlap: %s", options.getOverlap()));
output.add(String.format("token: %s", options.getToken()));
output.add(String.format("ignoreFailures: %s", options.getIgnoreFailures()));
return Joiner.on(", ").join(output);
}