Problem/Motivation
The system_maintenance migration lists:
source:
plugin: variable
variables:
- site_offline_message
source_module: system
But site_offline_message hasn't been in use since #201415: Add permission to access site in maintenance mode, which was committed over a decade ago in https://git.drupalcode.org/project/drupal/commit/a9762cd3bf93ac8bbcafec2...😬
Proposed resolution
Change it to:
source:
plugin: variable
variables:
- maintenance_mode_message
source_module: system
Remove the variable 'site_offline_message' from the d7 fixture and keep the existing 'maintenance_mode_message', which has the same text so there will be no changes to the existing migration test.