These unstructured messages are quite noisy and don't provide much
useful information in production:

```
source=rack-timeout id=RhEremul7w2 timeout=60000ms service=5ms \
state=completed
source=rack-timeout id=VMaWDTdCQo1 timeout=60000ms state=ready
```

Relates to https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/9123