Breaking: #82832 - Use at daemon dropped from scheduler
See forge#82832
Description
The functionality to execute tasks via the unix "at daemon" (atd) has been dropped.
The following method has been dropped:
TYPO3\CMS\ Scheduler\ Scheduler->schedule Next Scheduler Run Using At Daemon ()
Impact
If this feature has been used, existing tasks may not be executed anymore.
Affected Installations
The feature "useAtdaemon" had to be explicitly enabled in scheduler extension configuration. In general it was very sparsely used.
Migration
Switch to cron execution instead.