Hi ewan000
I found the link to the documentation that you were looking for https://docs.splunk.com/Documentation/ITSI/4.1.0/ReleaseNotes/Removedfeatures#Entity_Alias_Filtering_field . In terms of getting the KPI to filter for specific entities you would just need to set it up a bit differently.
You can find more information around the removed feature here in Splunk's ITSI documentation.
Hope that helps.
Herman
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