After customizing the table-ec-navigation-config.xml file in the $SPECROOT/custom/ec/config directory to add the Alarm Severity attribute, the Event Config Editor shows the Severity column as expected but does not displaying the Severity of alarm associated with event.
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Adding the Severity can not be achieved by modifying the table-ec-navigation-config.xml file. For the existing columns/tabs, we have the java implementation to retrieve the values of the event row that is selected. Since, we don't have the implementation to support for the Severity tab, it is not listed in the Table Preferences of EC Configuration and is not supported.
Any version of Spectrum running on any supported operating system.
This is functioning as designed.