[ThePhysicist]

They also offer a solution that analyzes access logs, which is useful to capture traffic from ad-blocking users from your web server. As far as I understand it's not part of the open-source version though.

We run Matomo on a self-hosted server for all our websites and it works very well, there's a large discrepancy between the traffic / visitor count shown by Cloudflare and Matomo though: Matomo will show 50-80 % less unique visitors than Cloudflare, which seems a lot even when accounting for ad-blocking users. It might be due to our very user-friendly cookie script though, which only loads Matomo after the user explicitly clicks on OK (and he/she can click on "Decline" as well). Guess we should investigate how many people actually click on "Decline".