Pigeonhole sieve_user_log

[dovecot at ptld.com]

https://doc.dovecot.org/configuration_manual/sieve/configuration/

Pigeonhole creates logs separate from main dovecot logs. I see 
sieve_user_log allows you to change log location and it says if you 
don't set it logs are still made by default.

I can not find anything about log rotation of these pigeonhole logs or 
if there is a way to disable this logging. Do i need to worry about this 
log growing out of control? Is there a way to disable it? Does it 
prune/purge itself? Any practical reason to keep these logs?