The Cleared Alert History display columns can be configured in the SOI console. To configure the available columns go to the SOI UI server and edit the \SOI\SamUI\webapps\sam\WEB-INF\sam\config\table-alarmhistory-config.xml file. To add Add User Attribute 1 update the column list to include the below for example:
<column-list>
<column idref="column-userDefined1-config">
<default-width>80</default-width>
<hidden-by-default>false</hidden-by-default>
</column>
</column-list>
Other items could be added also, the \SOI\SamUI\webapps\sam\WEB-INF\alarm\config\alarm-table-config.xml file has a column list in it for reference.