I need to set up an automation to close all child tickets when a parent ticket is closed, This is standard functionality in other service management tools, so that one response can be sent out to all customers who report an issue. I cannot establish how to do this with automation, nor how to pull up only the children of any specific ticket via JQL.
To take your question in reverse order, finding "children" depends on what you mean, but I think you'll be able to use the "parent" JQL field in your query.
If you implemented the parent/child relationship with issue links, that's the linkedIssuesOf() function.
Once you have the list of issues, the automation is straightforward. Trigger on a state transition to a closed state, search for children of the triggering ticket, and transition each child ticket to a closed state.
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