Dans /etc/openvpn/common.conf, la configuration indique que le niveau de verbosité de nos logs est actuellement de 4 :

; Logs
verb 4

Doc de la page de man openvpn sur l'option verb :

       --verb n
              Set  output  verbosity  to n (default=1).  Each level shows all info from the previous levels.  Level 3 is recommended if you want a
              good summary of what's happening without being swamped by output.

              0 -- No output except fatal errors.
              1 to 4 -- Normal usage range.
              5 -- Output R and W characters to the console for each packet read and write, uppercase is used for TCP/UDP packets and lowercase is
              used for TUN/TAP packets.
              6 to 11 -- Debug info range (see errlevel.h for additional information on debug levels).

Proposition : mettre le niveau de verbosité à 3 suite aux informations de la page de man.

https://linuxconfig.org/logrotate

https://support.rackspace.com/how-to/sample-logrotate-configuration-and-troubleshooting/

https://www.balabit.com/documents/syslog-ng-ose-latest-guides/en/syslog-ng-ose-guide-admin/html/example-logrotate.html

http://www.wpollock.com/AUnix2/Logging.htm