Hi, nravichandran,
To start with the basics: are you already gathering CPU data into Splunk? If so, are you using the latest version of the Splunk Add-Ons for Windows and/or *nix to gather that data? The Splunk add-ons should tag the data automatically. If you're gathering the data in another way, you may need to add tags to the data yourself in order to use the data models (see the docs on how to normalize your data to the Common Information Model). Alternatively, you could build your KPI using a search that doesn't use the data models that require the tags. You might want to look at updating ITSI to the latest version as well - KPI base searches were introduced in version 2.2, which let you share a search definition across multiple KPIs.
Hope this helps!
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