Defect Heatmap – This report generates a heatmap for the selected ALM Octane defects.

It also applies automatically the filter chosen for this heatmap, i.e. If you want to see the heatmap for a specific release, you can set the filter in ALM Octane and select all defect to generate this heatmap.

https://github.com/a1m0ctane/octane_python_examples

The action (button for the external action editor: https://admhelp.microfocus.com/octane/en/15.0.40/Online/Content/AdminGuide/custom-buttons.htm), you can find in External Actions.Defect Reporting.external-actions-editor-json.

Just copy the content to you ALM Octane External Action Editor. See this External Action in a short demo: