It was missing in redis#12223, and the reply-schemas daily
was failing:
```
jsonschema.exceptions.ValidationError: 'nothing' is not valid under any of the given schemas

Failed validating 'oneOf' in schema[0]['properties']['loglevel']:
    {'oneOf': [{'const': 'debug'},
               {'const': 'verbose'},
               {'const': 'notice'},
               {'const': 'warning'},
               {'const': 'unknown'}]}

On instance['loglevel']:
    'nothing'
```