spec:
  metrics:
  - providers:
    - name: prometheus
    overrides:
    - match:
        metric: REQUEST_COUNT
      tagOverrides:
        response_code:
          value: "istio_responseClass"
        request_operation: 
          value: istio_operationId
        grpc_response_status: 
          value: istio_grpcResponseStatus
        custom_dimension: 
          value: "'test'"
        source_principal: