Does the log FileTarget toggle files or keep everything in one file?

I have a question about the log FileTarget. Does it toggle the app.log file into multilpe files when it reach some sort of limit (like 1000 rows) or does it just keep on adding rows to the one single file "app.log"?

Thanks

(reference: http://www.yiiframework.com/doc-2.0/guide-runtime-logging.html)

My app.log in the default advanced setup is 5000 rows, so out-of-the-box No

There may be a config setting.