Just updated weewx installation from 3.9.1 to 3.9.2.
Looks like the copygenerator is not writing files, which should be then upload via FTP:
Aug 13 13:17:01 raspberrypi rsyslogd-2007: action 'action 17' suspended, next retry is Tue Aug 13 13:18:31 2019 [try
http://www.rsyslog.com/e/2007 ]
Aug 13 13:17:01 raspberrypi CRON[1259]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Aug 13 13:20:14 raspberrypi weewx[827]: manager: Added record 2019-08-13 13:20:00 CEST (1565695200) to database 'weewx.sdb'
Aug 13 13:20:14 raspberrypi rsyslogd-2007: action 'action 17' suspended, next retry is Tue Aug 13 13:21:44 2019 [try
http://www.rsyslog.com/e/2007 ]
Aug 13 13:20:14 raspberrypi weewx[827]: manager: Added record 2019-08-13 13:20:00 CEST (1565695200) to daily summary in 'weewx.sdb'
Aug 13 13:20:16 raspberrypi weewx[827]: cheetahgenerator: Generated 8 files for report SeasonsReport in 2.11 seconds
Aug 13 13:20:17 raspberrypi weewx[827]: imagegenerator: Generated 14 images for SeasonsReport in 0.99 seconds
Aug 13 13:20:17 raspberrypi weewx[827]: copygenerator: copied 0 files to /var/www/html/weewx