Reporting error responses from the Loki server

[gkostov]

Hey,

I've been trying to set this up and, of course, while still trying to figure out the proper configuration set I've not added my auth credentials and the Loki server's been rejecting my logs. But the library was not reporting those errors even if I've set the onConnectionError option. After some debugging and looking through the code it appears that only actual connection errors will get reported there and successful requests resulting in failure responses will not. Are there any plans to expose this kind of errors? I understand that configuration errors should get caught early in development and never appear in production but still there is a chance that the remote side may change for some reason and start to reject my calls, so my code will need some way of detecting such conditions.

Cheers