Comment 6 for bug 1829394

How are you rebooting the machine?

If the reboot is happening in the middle of a hook execution, then I don't see any reason why there would be something in the logs.

The uniter writes that it is starting a hook into local state. If the uniter starts up and sees that it had previously started a hook but didn't finish it, it gets marked as an error. This is normal.

Hook executions are generally retried, except update-status.

The update-status hook will execute in five minutes ± jitter after the unit agent has started and connected to the controller.

This is expected behaviour.