I've created Epic with tasks and sub tasks inside it.
I would like to know how it is possible to change Epic status automaticly to 'On Going' once a task/sub-task under that Epic started.
Third Party addon like ScriptRunner or Automation can help you on those type of tasks. This is not something JIRA is offering out-of-the-box.
If you're looking at only doing this type of thing, Automation is a better choice in my opinion. While ScriptRunner offers a very wide range of other features like JQL functions and custom coding.
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