A calculated field in Splunk is designed to automatically add fields at search time using an eval expression. This feature allows users to define new fields based on existing data without needing to manually include an eval command in every search. Calculated fields simplify repeated search tasks by embedding the eval logic directly into the field configuration.
[References:, Splunk Docs: Calculated fields, Splunk Answers: Purpose of calculated fields, , , , , , ]
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