I have a game with auto-generated levels that people can play in parallel.
I want to track how many levels are being played at any time. For example
5 levels – 10000 users
7 levels – 1000 users
2 levels – 8000 users
15 levels – 500 users etc.
Every time a user exists/kills a level, I want them to send an update – user-id 5, 10 levels (earlier 11).
How can I achieve this?