/var/lib/prometheus/postfix-exporter/mail.log is growing indefintely

[jbartak]

Hi, we started using this exporter for monitoring our mail servers.
It runs in very default config. We've noticed it is writing into /var/lib/prometheus/postfix-exporter/mail.log and it size if growing indefinitely.

Right now:

|Debian-11|[root@qla-prod-ue1-la-smtp-01-1 bin]$ ls -lah /var/lib/prometheus/postfix-exporter/mail.log 
-rw-r----- 1 prometheus prometheus 6.1G Jul  3 18:41 /var/lib/prometheus/postfix-exporter/mail.log

How we should address this? Logrotate?
And why it needs to duplicate config mail.log when it is available in /var/log/mail.log?