How to check on the Gadget Usage for Jira DC/Server

Background

How to know which dashboards are using which gadgets and the total count of gadgets.
This information is especially useful for doing impact assessment before migrating to Jira Cloud.

App used

You can use a free Server/DC plugin (App Usage for Jira) which displays the dashboards that contain gadgets

For details, please refer to the Documentation provided by Atlassian.