bStats

After enabling server supporting plugins, you may notice that there is a folder named bStats in the /plugins/ directory, even though no plugin with that name has been installed on the server. This is because bStats is not a standalone plugin, but a feature built right into the platform. bStats is used to collect metrics. Sending this data is enabled by default. This can be disabled in the bStats configuration (/plugins bStats/config.yml) by setting enabled to false.

The collected metrics are publicly available. You can see them here.