Cleanup tasks before server stops listening

[nosammai]

I am trying to hook into the shutdown sequence of the server so that I can mark my health check route to return failing HTTP codes for some time during the shutdown sequence before the servers stops servicing requests. I tested and it looks like both on_cleanup and on_shutdown calls are fired after the listener is stopped, so I can't use those. It seems like maybe the AppRunner is the construct I need to use, but it will not let me modify state on the app instance from outside before I call AppRunner.cleanup().

Does anyone have a working pattern for something like this?