Hi @renansph
Npgsql isn't supported by the Elastic.Apm.NetCoreAll package which you use in the sample.
Good new is: it's supported by the profiler based agent. Here is the docs for that: Profiler Auto instrumentation | APM .NET Agent Reference [1.12] | Elastic
We also have a list of supported technologies list. We also list in what setup we support the specific library. You can see that here: Supported technologies | APM .NET Agent Reference [1.12] | Elastic