Should debug messages show in task outputs?

[MetRonnie]

Description

When stopping a workflow with --kill, you get this rather cryptic message for killed tasks

ignoring job kill result, unexpected task state: failed

A look at the code in cylc-flow shows this is a DEBUG level log message.

[oliver-sanders]

Good catch, I would say no.

I'm not sure that cryptic message should have occurred in the first place though, we should only attempt to kill active tasks right?