Strange log directory content for an OPNsense. Looks like a Linux based Ubuntu installation - not OPNsense Freebsd.OPNsense/Freebsd uses clog format, a binary circular rotation one. No deletions necessary due to fixed size and circular rotation.
Most of these files are circular logs of fixed size... deleting them will just bring them back after reboot with the same size. Why are you worried about these files?Cheers,Franco