Some of my products are having tracking system to collect information (statistics) about your computer/Minecraft server.
Tracking helps me a lot in improving the quality of my products. I can know how many people are using, I can know you are just a normal user or not, I can know how many players are playing on your Minecraft server, etc.
Tracking is very normal in nowadays so please don't suspect if this is the first time you know.
(*): only in Bukkit plugins.
You can view all general statistics here: https://stats.anhcraft.org/