fluentd log rotation， daily， how many log files retained？

[nuaazt]

hello， I want to output the log to files and I want to get one log file daily. Also, when the number of files exceeds 10, delete the oldest one.
I config the comand option :
fluentd -o /path/to/log_file --log-rotate-age daiy.

But how can it do the "when the number of files exceeds 10, delete the oldest one"？

[kenhys]

Combination with using /etc/logrotate.d/ configuration will work for you.