Current output looks like this:
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Cert not yet due for renewal
Cert not yet due for renewal
Cert not yet due for renewal
[...]
-------------------------------------------------------------------------------
Processing /etc/letsencrypt/renewal/domain.conf
-------------------------------------------------------------------------------
[...]
First, which looks like a bug: The first lines do not contain the domain. So they are either useless or incomplete.
And second a feature request: Can you replace “not yet due” by “not yet due (expires in XX days)”? This would be a useful information to add.