Log Clean-up configuration

Hi,

As the log files are generated in Appian and we too can view and download them. But I have a doubt about a few. Can you please solve them?

I listed my questions here:

    1. What is Appian Default log clean-up configuration?

    2. What is the log generation frequency?

    3. As the log files are generated and stored, do they delete automatically or can I delete them manually?

 Thanks.