Define a process to log out every connected user from a deployment so that everything gets saved before maintenance starts

[sanderegg]

During a maintenance we should make sure that any running service is if possible not deleted or more importantly its data is not lost. notifying users is not enough.

Ideally the maintainer should be able to kick off a process that:

1. Closes all open projects gracefully (so that states are correctly saved), with prior notifications (e.g. in 10 minutes your projects will be closed)
2. Prevents users from opening projects with a nice message (provided they can still access the dashboard)

Tasks

Beta Give feedback

1. schematics of logout mechanism and broadcasting
2. admin: logout_all
3. admin: set schedule maintenance -> validated and store to redis input
4. Communication channel between GC service and sockets #3387
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   t:enhancement +1
   

[odeimaiz]

I would also prevent users from login in, because you can still do some data related operations from the dashboard:

1. log all users out
2. maintenance website during maintenance-time

[sanderegg]

https://python-socketio.readthedocs.io/en/latest/server.html#using-a-message-queue

[odeimaiz]

The process that was discussed in Dec2021

Related cases:
#1635
#2128