Apache 2 licensed https://github.com/traceo-dev/traceo/blob/develop/LICENSE

why did you mention it?

Announcement posts tend to make it hard to find the source code, so I include the license in its source code repository.

It looks quite similiar to Grafana, but it seems that it is a combination of features from sentry and grafana?

Yes, Traceo has features that can be found in both Sentry and Grafana. All features can be found in the readme.

For me, it's a slightly nicer version of the Jaeger UI