Maintenance window on Appaloosa allows you to automate task during a certain period a time (usually a few hours during night).
This feature allow you to perform certain maintenance tasks on your devices.
For example you can automate OS Upgrade or application upgrade when our devices are not in used.
When your devices enter the maintenance window, they are flagged with maintenance mode. You can create groups or subgroups based on this device property to apply another configuration containing some task to perform during this time. For example you can upgrade the OS during this time or switch your apps to high priority update to force update your apps during this time.
To set a maintenance period navigate to Devices > Configurations, select your configuration in the Global tab you will see the maintenance timeframe for your store.
You can then use the new maintenance mode filter to automatically move your devices to another group with a different configuration.