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Performance counters that can be queried from perfmon or Powershell. This functionality existed for RS SQL Server 2016, now it's gone for PBIRS.
Example
https://docs.microsoft.com/en-us/sql/reporting-services/report-server/performance-counters-reportserver-service-performance-objects?view=sql-server-2016&viewFallbackFrom=sql-server-ver15
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