Where do we get the Jira Gadget related files in server

[l]

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We are planning to develop a Jira gadget for cumulative defect count automation.
we would like to know more about the gadget development.
we have gone through the atlassian documentation, though we might need some help from your end.

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[Nic Brough -Adaptavist-]

If you've gone through the Atlassian documentation, you should be ok with creating the gadget and addon structure, so where are you stuck?