Istio 1.5: Isn't `telemetry.v2.stackdriver.monitoring` flag used?

I’m trying Istio 1.5 telemetry v2 with Stackdriver.
I have a question. It seems to me telemetry.v2.stackdriver.monitoring flag isn’t used. But is there any place it’s used or any plan to use it in the future?

I saw this configuration on default.yaml profile:

And I checked the template file:

I can see logging and topology are used:

But I can’t find any usage of monitoring flag. So I’m interested in the reason why it’s there?