Upgrading from SLES11 to SLES12 changed the compression for rotated log
files from bz2 to xz by default. This is fine, and I also know that how
to change to default settings for logrotate.
Still I am puzzled that the default configuration for logwatch was not
adapted to this change. As shipped logwatch is not able to read archived
log data and thus the --archives option is with not effect. How can I
change the configuration for logwatch in order to make use of the xz
utilities instead of bzip2? A corresponding setting is not present in
the logwatch.conf.