Some actions in pagure are meant to the run via a cron job.
One of the cron job sending reminder about API keys that are about to expire. It will send an email 10 days, then 5 days and finally the day before the key expires to the person who has created.
The cron job can be found in the sources in:
files/api_key_expire_mail.py
In the RPM it is installed in:
/usr/share/pagure/api_key_expire_mail.py
This cron job is meant to be run daily using a syntax similar to:
10 0 * * * root python /usr/share/pagure/api_key_expire_mail.py
which will make the script run at 00:10 every day.