Get traces / errors in a better shape

[caio]

Traces are in a weird shape; when not running on debug the warns it emits don't contain any useful info.

Issue opened to handle this with more care. Errors might include more data to make them more actionable (not sure this will be the case), but warn/error traces should definitely include useful metadata instead of requiring a rerun with the very noisy debug level.

REF #2 (comment)