[galaxy-dev] Lock Galaxy job submission

Hello all, It is my recollection that under the "Admin" panel, "Manage jobs" page, there used to be a toggle control to lock the submission of new jobs. This was very helpful in preparation for scheduling a system shutdown (e.g. for hardware or software updates). However, I no longer see this option on either galaxy-central or galaxy-dist. Was it removed, or am I imagining things - in which case should I file an enhancement request ;) (I've had a look in Trello and didn't find anything) Thanks, Peter