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The Zephyr for JIRA Test Metrics macro can be inserted on any page via the "Insert" menu or searching for it in the Macro Browser. On clicking the "Edit" button on the inserted macro, the following dialog is shown that allows the appropriate gadget to be selected. You can further customize what shows up in the gadget by selecting it on the page and clicking on "Edit".
Note that these are the exact same gadgets that you would see in your Zephyr for JIRA Dashboards that are now being shown in Confluence.
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