Breaking configuration changes in borgmatic-1.6.0 - 23/05/2022 00:00 GMT

Version 1.6.0 of app-backup/borgmatic has introduced some breaking
changes to the way Borgmatic handles the merging of its configuration
files and executes command hooks. If you use these features, please
review your Borgmatic config files to make sure they continue to work
correctly with >=app-backup/borgmatic-1.6.0. For details, see [1].

[1] https://github.com/borgmatic-collective/borgmatic/releases/tag/1.6.0