Pack Analytics
A simple Minecraft modification designed for modpack creators that gathers anonymous player count data. The collected information is sent to a centralized web server and stored in InfluxDB for convenient historical data viewing through Grafana:

The mod integrates with Better Compatibility Checker and will utilize the version number from your BCC configuration when possible.
The metrics endpoint URL is customizable, along with the pack identifier and the frequency of keep-alive requests.

An example server implementation is available on GitHub – it simply collects current usage statistics for each pack ID and optionally forwards the data to Grafana.
Important note: this modification does not transmit player personal information, usernames, or unique identifiers. It only periodically sends a simple "I'm playing" request with the current pack version number to track active players.