App integration with logtail not show log level error as error

I have been experimenting with a basic app in Golang. I have added the logtail integration. I try to log on both errors and info, but the ERROR level gets converted to INFO, which sort of beats the purpose.

Today I reinitialized the PaperTrail integration and it demonstrates the same.

In addition I have evaluated both JSON and non-JSON logging without luck.

Is it possible to log errors in the documented/syslog way. Any pointers would be most welcome.

Example app: https://github.com/jonasbn/sample-golang