bug, test: fix tests for trace_id; readd import logging.config Made save_restore_logging a test level fixture. It was a class level which worked fine until I started using caplog for tests in the same class. Due to loading config from dict, the roundup channel was set to not propagate which broke the new formatting test used for trace_id. Forgot to update some tests due to change in default format adding %(trace_id). Also re-added logging.config import which broke loading logging config files in configuration.py.