By default, monitoring-prometheus-istio-server is not provided as a data source in Grafana.

1. To enable monitoring-prometheus-istio-server as a data source in Grafana, provide a YAML file with the following values:

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   monitoring  
     prometheus-istio:
       grafana:
         datasource:
           enabled: "true"

2. Deploy the values.yaml file (see Change Kyma settings).

3. Restart the Grafana deployment with the following command:

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   kubectl rollout restart -n kyma-system deployment monitoring-grafana