I'm using the latest version of MySQLTuner from https://raw.githubusercontent.com/major/MySQLTuner-perl/master/mysqltuner.pl
Please see https://pastebin.com/raw/UANtN1yV
Variables to adjust:
always use indexes with JOINs
Something appears to have gone wonky with the formatting here, as older versions of MySQLTuner would read something like this:
Variables to adjust: join_buffer_size (> 256.0K, or always use indexes with JOINs)