ubuntu smartd version
6.5+svn4324-1ubuntu0 and later (ubuntu 18.04 and newer) does not run with -A but still writes metrics into /var/lib/smartmontools csv files
it would be useful to make the plugin also search for this path instead of the default /var/log/smartd, which would allow smartd support out of the box
from ubuntu 18.04 man page
-A PREFIX, --attributelog=PREFIX If this option is not specified, attribute information is written to files ´/var/lib/smartmontools/attrlog.MODEL-SERIAL.ata.csv´. To disable attribute log files, specify this option with an empty string argument: ´-A ""´.