Library is swallowing log messages from function code

I'm using logging messages in my python code, but none of those are ever visible. I'm currently configuring my logger like so:

```python

formatter = json_log_formatter.JSONFormatter()
handler = logging.StreamHandler(sys.stdout)

if conf.USE_JSON_LOGGING:
handler.setFormatter(formatter)

logging.basicConfig(
level=logging.INFO,
format='[%(asctime)s] {%(filename)s:%(lineno)d} %(levelname)s - %(message)s', # noqa
handlers=[handler],
)
logger = logging.getLogger(__name__)
```

However, I never see the logs. Where are they going?