I'm working on an app that tracks errors in your applications. Currently, it supports NodeJS servers and JS frontends. It reports detailed information about the error like console logs, code snippets, stacktrace, occurrences with timestamps, previous user interactions and custom data. In addition, it allows you to track data about your websites visitors such as page views, unique visitors, sessions, time on page, referrers and device data. It's all done in a very transparent manner with as little data as possible. It's written in Go and React and is completely open-source and can easily hosted by yourself.

https://github.com/jz222/loggy https://github.com/jz222/loggy-client