From Bright Pattern Documentation
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service_performance
service_performance metrics are a subset of metrics derived from the service_in_time_counters table.
Such metrics are maintained only in order to support existing service-related custom reports designed prior to the release of Bright Pattern Contact Center version 3.5.2. All service_performance metrics are available in the service_in_time_counters table, which is recommended for the development of any new service-related reports.