This bundle is the "eZ5 port" of the ezperformancelogger extension for eZ Publish, available at https://github.com/gggeek/ezperformancelogger.
To work at all, it in fact depends on the ezperformancelogger extension to be installed.
The base idea is that code duplication is avoided by keeping all existing ezperformancelogger php code intact, and just providing a thin integration layer in the bundle. This has the nice benefit of keeping compatibility with pure-legacy and mixed-mode installations.
NB: if you have an eZ Publish 5 installation which runs in "pure legacy" mode, you should NOT use this bundle.
NB: this bundle for the moment allows to report only KPIs measuring on Legacy Stack activity; it does not measure activity related to the Symfony stack.
Installation of both this bundle and the associated extension is normally handled through composer - the developer has almost nothing to do - for some definition of 'almost nothing' ;-)
Head on to INSTALL.md for the quirky details.