Is there a more eloquent way to achieve this (see title above) as a Cloud customer? Since the parent's 'Updated' field does not get touched when a subtask is touched, I've klujed this which allows me to listen to parents for changes made based on state changes down below on subtasks, and use this trigger to perform other post processing I'm doing with the data outside of JIRA through other integrations I've built.
I believe that's pretty much the only way to achieve that. As a possible alternative, you might want to use the post function that transitions the parent issue, that would change the 'Updated' field in the parent issue. Please see Moving a Sub-Task to In Progress does not Transition its Parent's to the Same Status for more details about this.
Hope this helps.
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