feature-sites/Metrics System
This plugin utilises Hidendra's plugin metrics system, which means that the following information is collected and sent to mcstats.org:
A unique identifier
The server's version of Java
Whether the server is in offline or online mode
The plugin's version
The server's version
The OS version/name and architecture
The core count for the CPU
The number of players online
The Metrics version
Opting out of this service can be done by editing plugins/Plugin Metrics/config.yml and changing opt-out to true.