Closes#40884
- Make IOPub task return a `Result`
- Create a monitoring task that watches over IOPub, Control, Routing and
Shell tasks.
- If any of these tasks fail, report the error with `kernel_errored()`
(which is already used to report process crashes)
https://github.com/user-attachments/assets/3125f6c7-099a-41ca-b668-fe694ecc68b9
This is not perfect. I did not have time to look into this but:
- When such errors happen, the kernel should be shut down.
- The kernel should no longer appear as online in the UI
But at least the user is getting feedback on what went wrong.
Release Notes:
- Jupyter client errors are now surfaced in the UI (#40884)
3248a05406