You can use vSAN performance diagnostics to improve the performance of your vSAN cluster, and resolve performance issues. The vSAN performance diagnostics tool analyzes previously run benchmarks gathered from the vSAN performance service. It can detect issues, suggest remediation steps, and provide supporting performance graphs for further insight. vSAN uses CEIP to send data to VMware for analysis.
More details available at: https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.virtualsan.doc/GUID-47ABB4AE-98D7-4373-A61B-4DB72875A6DD.html