add sentence describing metrics service

content/docs/2.14/operate/cluster.md

@@ -129,9 +129,9 @@ The Kubernetes client config used within KEDA Operator and KEDA Metrics Adapter
 | kube-api-burst      | cfg.Burst               | 30            | Set the burst for throttling requests sent to the apiserver    |
 | disable-compression | cfg.DisableCompression  | true          | Disable compression for response in k8s restAPI in client-go, see [this Kubernetes issue](https://github.com/kubernetes/kubernetes/issues/112296) for details |
 
-## Metrics Service Parameters
+## gRPC Metrics Service Parameters
 
-The Metrics Service config used by the KEDA Metrics Adapter to connect to the KEDA Operator can be adjusted by passing the following command-line flags to the Adapter binary:
+The gRPC Metrics Service is part of the KEDA Operator deployment and serves scaling events and metrics from the scalers over gRPC to the Metrics API Service, that in turn serves them to the Kubernetes API Server. The gRPC Metrics Service config used by the KEDA Metrics Adapter to connect to the KEDA Operator can be adjusted by passing the following command-line flags to the Adapter binary:
 
 |     Adapter Flag                    | Default Value                                     | Description                                    |
 | ----------------------------------- | ------------------------------------------------- | ---------------------------------------------- |