When trying to add a Postgresql data source (running inside the service mesh/ with sidecar) to Grafana (running outside service mesh/ without sidecar), a connection cannot be established, however it is able to translate the fully qualified domain name ({app}.{namespace}.svc.cluster.local) into the correct IP address for the service.

I have attempted pinging the grafana pod from the Postgres pod by exec-ing in, which times out but correctly translates the FQDN to the IP address.

Postgres logs do not show any errors or connection attempts, grafana logs show a 500 error when trying to "Save & Test" the datasource in the grafana dashboard.

Expected behaviour is a successful connection to the datasource, would I have to configure a certain istio object to enable the out-of-service-mesh dashboard/pod to access the in-service-mesh datasource/pod.