Want to know how many clients connected to the service when use the Per-Session Mode?

Question

From the service-side point of view, I want to know how many clients connected to the server at a time point.

In our scenario, we have 50+ pos app running at the same time, we want to monitor every pos app, we plan to use Per-Session mode service, and every pos run a proxy which connect to the server-side service.

can somebody give us some suggestion?

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Hello