Introduction

Varnish Custom Statistics provides granular and detailed performance metrics on your cache contents and its associated traffic. It produces real-time aggregated statistics from a group of Varnish servers. Then these statistics are grouped according to keys defined in VCL and presented in time series.

VCS is split into two components:

• vcs server: This is the main database, UI, and API server for VCS and it should be installed on a separate server.
• vcs-agent: They connect and push data to the vcs server and are installed on each of your Varnish servers.

Please refer to our VCS 4.0 documentation for more information.