Yes, there are no brightness change events, but reading the brightness is very fast so polling adds very little overhead.

For analytics I've just been using a plain nginx route that logs the request body to a static file, and I parse that using loki for further visualization in Grafana. I haven't found much value in that info though so I've decommissioned it after I migrated from nginx to Caddy. I'll remove the analytics request in the next update.