How to re-run a task stuck in submitted or running?

[dpmatthews]

A task can remain stuck in submitted or running if a platform becomes unreachable (so polling cannot determine the task state).
How can you re-trigger the task?
You may be able to use cylc remove and then trigger the task (not tested) but that could result in the workflow shutting down if there were no other tasks in the pool.

With Cylc 7 you could have used reset-state

See https://cylc.discourse.group/t/7-to-8-first-steps/514/6

[hjoliver]

The simplest solution would be to take the trigger command at face value and allow retriggering of (supposedly-)already-active tasks. The (arguable) downside of this is that task ID globs might have to be more specific, to avoid already-active tasks if you don't want to retrigger them.

Alternatively, add a new option: cylc trigger --force.

[dpmatthews]

Sorry, already raised as a question: #5147