Is there a way to check if a group has any open connections?

I would like to be able to check if a group I am about to send a message to has any open connections and possibly how many. I see this information is available internally on the client hub in the lifetime manager > client connection manager but i don’t see any of this exposed in any way. The reason I want to perform this check is to decide if I should send a SignalR message to the connected clients or send a push notifications (I’m dealing with iOS mobile clients). Currently I don’t see any way of doing something like that.

[vicancy]

We plan to add an existence check in the service REST API to check “if a group has any open connections”, according to the deployment schedule it would be available in late April, and ManagementAPI will be updated accordingly after the service is ready.

[danielleiszen]

So if I understand correctly in a simple scenario when there is only one SignalR server. The internal lifetime manager already maintains a collection of connected clients. But the suggested way is to replicate that collection and maintain it for myself just because the API does not provide a readonly way of querying it.

I think it should be opened as a readonly collection because for debug purposes it is just way more convenient than writing a whole infrastructure in order to create something that is already there.