It is easy.

Like 5 minutes to implement easy.

SELECT count(users) from users;

SELECT count(users) from users u Where u.lastOnlineDate between now And 10 minutes.

Then just cache the two numbers and run that sequel every 5 minutes.

Then, make a rest endpoint.

@GetMappings("api/users/count") Public ResponseEntity<Long> getMaxSubscribers() { Return ResponseEntity.ok().body(entity from sql above).build() }

The add a counter in the UI. <row> <label> total subscribers </label>

<div> {totalSubscribers} </div> </row>

And finally add the api call to the client web side.

Const totalSubscribers = this.getMaxSubscribers();

That's it. 5 minutes max.