Unknown system variable 'show_compatibility_56' I like backupninja because of simplicity. Unfortunately it started giving me this problem:


  Warning: mysqldump: Couldn't execute 'SELECT /*!40001 SQL_NO_CACHE */
  dead.letter FROM GLOBAL_STATUS': The
  'INFORMATION_SCHEMA.GLOBAL_STATUS' feature is disabled; see the
  documentation for 'show_compatibility_56' (3167)


It looks like this can be fixed with set @@global.show_compatibility_56=ON. Unfortunately that doesn't work on my MariaDB instance:


  Welcome to the MariaDB monitor.  Commands end with ; or \g. Your
  MariaDB connection id is 73 Server version: 10.1.26-MariaDB-0+deb9u1
  Debian 9.1
  
  Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
  
  Type 'help;' or '\h' for help. Type '\c' to clear the current input
  statement.
  
  MariaDB [(none)]> set @@global.show_compatibility_56=ON;
  ERROR 1193 (HY000): Unknown system variable 'show_compatibility_56'


What else can I try to resolve this?
This has been fixed so a later version (>1.0.2) of backupninja will likely resolve your issue.