Does the debug.log do log rotation?

No, it creates only one file. There is no log rotation involved.

But… Sometimes “but” can be a good thing 😉

WP uses error_log for its debug log, so you can change its location using:

ini_set( 'error_log', WP_CONTENT_DIR . '/debug-' . date('Y-m-d') . '.log' );

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