pt-query-digest --type binlog (percona-toolkit) gives empty output with MariaDB/Galera 10.1
See Reading RBR binary logs with pt-query-digest and LP #1377887: pt-query-digest fails to parse binary log with RBR events

That bug report is over 2 years old and ranked as "low" priority.  Suggest you add a comment to clue Percona in that there is interest in getting it fixed.