how to identify number of active subscribers by subscription in appsync

[ghost]

Need to keep count of how many subscribers are connected with each subscription.

For UserA, UserB are connected with SubscriptionA : then 2 is the total subscribers
For UserA are connected with SubscriptionB : then 1 is the total subscribers

Can i know when UserA unsubscribes , subscribes, disconnects, reconnects from AppSync ?

[rudyhadoux]

You can add to User a boolean attribute for "a connected state". And do subscriptions linked to this attribute.