There are two places which configure logging: /system logging action and /system logging. The former is more general and sets destinations of log messages, while the later configure actual logs to be generated (and stored).
By default, there are 4 entries in /system logging:
There are probably more if you added some logging actions and you should (prior to removing entries in /system logging action) remove entries with action set to custom actions (see below) by executing commands such as remove after you executed print, with being index number from preceding print command output.
By default, there are 4 entries in /system logging action:
(disk-file-name in rule #1 could be different depending on device type).
With your additions you’ll see additional actions and those you can remove (by executing e.g. remove after you executed print, with being index number from preceding print command output).