(A user migrating from another solution asked whether Matomo has the following)
Add an option in the tool to help to find anomalies.
Just a few links about this topic before I forget them again:
I'm sure this concept can be easily mapped to e.g. pageviews (or other metrics) per day. And I didn't look it up, but there is probably also some existing research in that space.
This could probably even be implemented in PHP, similar to how Nextcloud did their neural-network-based plugin: