Until Horizon 29, Sentinel as a container ran perfectly fine with flows enabled, configuring as described in the official documentation. Starting with Horizon 30, something is missing preventing the flow adapters from starting.

After some research and testing, based on the missing class from the errors I got, I found that adding the sentinel-timeseries-api feature to featuresBoot.d solves the problem on Horizon 31.

Interestingly, it was since Horizon 30 that the base image changed from centos to ubuntu, among other changes that could lead to missing some required dependencies.

I suspect this problem might exist on a bare-metal installation on Ubuntu/Debian, but I haven’t had time to verify it.