It is a bit weird that in my /var/log dir, many files such as syslog, auth.log all seem to have older log files (rotated by [0-9], some like dpkg.log even rotates to 12 now), but the important wtmp log file only has a wtmp.1 rotation, which stores pretty recent log (I have been using the laptop for several years, so in normal case it should have more wtmp logs).
Is it because of some system setting that prevents my laptop from storing more wtmp logs? (I do not recall that I changed the default setting for this.)
Thank you.